diff --git a/README.md b/README.md
index 8257fc8..01021c5 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,9 @@ Set Debian packages server address. Choose a server from the list of Debian worl
 ##### `APT_PROXY`=""
 Set Proxy server address. Using a local Proxy-Cache like `apt-cacher-ng` will speed-up the bootstrapping process because all required Debian packages will only be downloaded from the Debian mirror site once. If `apt-cacher-ng` is running on default `http://127.0.0.1:3142` it is autodetected and you don't need to set this.
 
+##### `KEEP_APT_PROXY`=false
+Keep the APT_PROXY settings used in the bootsrapping process in the generated image.
+
 ##### `APT_INCLUDES`=""
 A comma-separated list of additional packages to be installed by debootstrap during bootstrapping.
 
@@ -210,6 +213,9 @@ Support for halt,init,poweroff,reboot,runlevel,shutdown,telinit commands
 ---
 
 #### Advanced system features:
+##### `ENABLE_SYSTEMDSWAP`=false
+Enables [Systemd-swap service](https://github.com/Nefelim4ag/systemd-swap). Usefull if `KERNEL_ZSWAP` is enabled.
+
 ##### `ENABLE_MINBASE`=false
 Use debootstrap script variant `minbase` which only includes essential packages and apt. This will reduce the disk usage by about 65 MB.
 
@@ -234,6 +240,12 @@ Install and enable the [ARM side libraries for interfacing to Raspberry Pi GPU](
 ##### `VIDEOCORESRC_DIR`=""
 Path to a directory (`userland`) of [ARM side libraries for interfacing to Raspberry Pi GPU](https://github.com/raspberrypi/userland) that will be copied, configured, build and installed inside the chroot.
 
+##### `ENABLE_NEXMON`=false
+Install and enable the [Source code for a C-based firmware patching framework for Broadcom/Cypress WiFi chips that enables you to write your own firmware patches, for example, to enable monitor mode with radiotap headers and frame injection](https://github.com/seemoo-lab/nexmon.git).
+
+##### `NEXMONSRC_DIR`=""
+Path to a directory (`nexmon`) of [Source code for ARM side libraries for interfacing to Raspberry Pi GPU](https://github.com/raspberrypi/userland) that will be copied, configured, build and installed inside the chroot.
+
 ##### `ENABLE_IPTABLES`=false
 Enable iptables IPv4/IPv6 firewall. Simplified ruleset: Allow all outgoing connections. Block all incoming connections except to OpenSSH service.
 
@@ -261,6 +273,15 @@ Create an initramfs that that will be loaded during the Linux startup process. `
 ##### `ENABLE_IFNAMES`=true
 Enable automatic assignment of predictable, stable network interface names for all local Ethernet, WLAN interfaces. This might create complex and long interface names.
 
+##### `ENABLE_SPLASH`=true
+Enable default Raspberry Pi boot up rainbow splash screen.
+
+##### `ENABLE_LOGO`=true
+Enable default Raspberry Pi console logo (image of four raspberries in the top left corner).
+
+##### `ENABLE_SILENT_BOOT`=false
+Set the verbosity of console messages shown during boot up to a strict minimum.
+
 ##### `DISABLE_UNDERVOLT_WARNINGS`=
 Disable RPi2/3 under-voltage warnings and overlays. Setting the parameter to `1` will disable the warning overlay. Setting it to `2` will additionally allow RPi2/3 turbo mode when low-voltage is present.
 
@@ -345,6 +366,23 @@ With this parameter set to true the script expects the existing kernel sources d
 ##### `RPI_FIRMWARE_DIR`=""
 The directory (`firmware`) containing a local copy of the firmware from the [RaspberryPi firmware project](https://github.com/raspberrypi/firmware). Default is to download the latest firmware directly from the project.
 
+##### `KERNEL_DEFAULT_GOV`="ONDEMAND"
+Set the default cpu governor at kernel compilation. Supported values are: PERFORMANCE POWERSAVE USERSPACE ONDEMAND CONSERVATIVE SCHEDUTIL
+
+##### `KERNEL_NF`=false
+Enable Netfilter modules as kernel modules
+
+##### `KERNEL_VIRT`=false
+Enable Kernel KVM support (/dev/kvm)
+
+##### `KERNEL_ZSWAP`=false
+Enable Kernel Zswap support. Best use on high RAM load and mediocre CPU load usecases
+
+##### `KERNEL_BPF`=true
+Allow attaching eBPF programs to a cgroup using the bpf syscall (CONFIG_BPF_SYSCALL CONFIG_CGROUP_BPF) [systemd compilations about it - File /lib/systemd/system/systemd-journald.server:36 configures an IP firewall (IPAddressDeny=all), but the local system does not support BPF/cgroup based firewalls]
+
+##### `KERNEL_SECURITY`=false
+Enables Apparmor, integrity subsystem, auditing 
 ---
 
 #### Reduce disk usage:
@@ -392,6 +430,12 @@ Set cipher specification string. `aes-xts*` ciphers are strongly recommended.
 ##### `CRYPTFS_XTSKEYSIZE`=512
 Sets key size in bits. The argument has to be a multiple of 8.
 
+##### `CRYPTFS_DROPBEAR`=false
+Enable Dropbear Initramfs support
+
+##### `CRYPTFS_DROPBEAR_PUBKEY`=""
+Provide path to dropbear Public RSA-OpenSSH Key
+
 ---
 
 #### Build settings:
diff --git a/bootstrap.d/11-apt.sh b/bootstrap.d/11-apt.sh
index 544781c..33b3cc1 100644
--- a/bootstrap.d/11-apt.sh
+++ b/bootstrap.d/11-apt.sh
@@ -11,6 +11,13 @@ if [ -z "$APT_PROXY" ] ; then
   sed -i "s/\"\"/\"${APT_PROXY}\"/" "${ETC_DIR}/apt/apt.conf.d/10proxy"
 fi
 
+# Install APT sources.list
+install_readonly files/apt/sources.list "${ETC_DIR}/apt/sources.list"
+
+# Use specified APT server and release
+sed -i "s/\/ftp.debian.org\//\/${APT_SERVER}\//" "${ETC_DIR}/apt/sources.list"
+sed -i "s/ stretch/ ${RELEASE}/" "${ETC_DIR}/apt/sources.list"
+
 # Upgrade package index and update all installed packages and changed dependencies
 chroot_exec apt-get -qq -y update
 chroot_exec apt-get -qq -y -u dist-upgrade
diff --git a/bootstrap.d/13-kernel.sh b/bootstrap.d/13-kernel.sh
index a662049..c29a977 100644
--- a/bootstrap.d/13-kernel.sh
+++ b/bootstrap.d/13-kernel.sh
@@ -5,6 +5,14 @@
 # Load utility functions
 . ./functions.sh
 
+# Need to use kali kernel src if nexmon is enabled
+if [ "$ENABLE_NEXMON" = true ] ; then
+  KERNEL_URL="${KALI_KERNEL_URL}"
+  # Clear Branch and KernelSRC_DIR if using nexmon. Everyone will forget to clone kali kernel instead of nomrla kernel
+  KERNEL_BRANCH=""
+  KERNELSRC_DIR=""
+fi
+
 # Fetch and build latest raspberry kernel
 if [ "$BUILD_KERNEL" = true ] ; then
   # Setup source directory
@@ -87,6 +95,283 @@ if [ "$BUILD_KERNEL" = true ] ; then
       # Load default raspberry kernel configuration
       make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" "${KERNEL_DEFCONFIG}"
 
+      #Switch to KERNELSRC_DIR so we can use set_kernel_config
+      cd "${KERNEL_DIR}" || exit
+
+	  # enable ZSWAP see https://askubuntu.com/a/472227 or https://wiki.archlinux.org/index.php/zswap
+      if [ "$KERNEL_ZSWAP" = true ] ; then
+        set_kernel_config CONFIG_ZPOOL y
+        set_kernel_config CONFIG_ZSWAP y
+        set_kernel_config CONFIG_ZBUD y
+        set_kernel_config CONFIG_Z3FOLD y
+        set_kernel_config CONFIG_ZSMALLOC y
+        set_kernel_config CONFIG_PGTABLE_MAPPING y
+		set_kernel_config CONFIG_LZO_COMPRESS y
+	  fi
+
+      # enable basic KVM support; see https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=210546&start=25#p1300453
+	  if [ "$KERNEL_VIRT" = true ] && { [ "$RPI_MODEL" = 2 ] || [ "$RPI_MODEL" = 3 ] || [ "$RPI_MODEL" = 3P ] ; } ; then
+		set_kernel_config CONFIG_HAVE_KVM_IRQCHIP y
+        set_kernel_config CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL y
+        set_kernel_config CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT y
+        set_kernel_config CONFIG_HAVE_KVM_EVENTFD y
+        set_kernel_config CONFIG_HAVE_KVM_IRQFD y
+        set_kernel_config CONFIG_HAVE_KVM_IRQ_ROUTING y
+        set_kernel_config CONFIG_HAVE_KVM_MSI y
+        set_kernel_config CONFIG_KVM y
+        set_kernel_config CONFIG_KVM_ARM_HOST y
+        set_kernel_config CONFIG_KVM_ARM_PMU y
+        set_kernel_config CONFIG_KVM_COMPAT y
+        set_kernel_config CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT y
+        set_kernel_config CONFIG_KVM_MMIO y
+        set_kernel_config CONFIG_KVM_VFIO y
+        set_kernel_config CONFIG_VHOST m
+        set_kernel_config CONFIG_VHOST_CROSS_ENDIAN_LEGACY y
+        set_kernel_config CONFIG_VHOST_NET m
+        set_kernel_config CONFIG_VIRTUALIZATION y
+		
+		set_kernel_config CONFIG_MMU_NOTIFIER y
+		
+		# erratum
+		set_kernel_config ARM64_ERRATUM_834220 y
+		
+		# https://sourceforge.net/p/kvm/mailman/message/18440797/
+		set_kernel_config CONFIG_PREEMPT_NOTIFIERS y
+	  fi
+
+      # enable apparmor,integrity audit,
+	  if [ "$KERNEL_SECURITY" = true ] ; then
+
+        # security filesystem, security models and audit
+        set_kernel_config CONFIG_SECURITYFS y
+        set_kernel_config CONFIG_SECURITY y
+        set_kernel_config CONFIG_AUDIT y
+
+        # harden strcpy and memcpy
+        set_kernel_config CONFIG_HARDENED_USERCOPY=y
+        set_kernel_config CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR=y
+        set_kernel_config CONFIG_FORTIFY_SOURCE=y
+
+        # integrity sub-system
+        set_kernel_config CONFIG_INTEGRITY=y
+        set_kernel_config CONFIG_INTEGRITY_ASYMMETRIC_KEYS=y
+        set_kernel_config CONFIG_INTEGRITY_AUDIT=y
+        set_kernel_config CONFIG_INTEGRITY_SIGNATURE=y
+        set_kernel_config CONFIG_INTEGRITY_TRUSTED_KEYRING=y
+
+        # This option provides support for retaining authentication tokens and access keys in the kernel.
+        set_kernel_config CONFIG_KEYS=y
+        set_kernel_config CONFIG_KEYS_COMPAT=y
+
+        # Apparmor
+        set_kernel_config CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE 0
+        set_kernel_config CONFIG_SECURITY_APPARMOR_HASH_DEFAULT y
+        set_kernel_config CONFIG_DEFAULT_SECURITY_APPARMOR y
+        set_kernel_config CONFIG_SECURITY_APPARMOR y
+        set_kernel_config CONFIG_SECURITY_APPARMOR_HASH y
+        set_kernel_config CONFIG_DEFAULT_SECURITY "apparmor"
+
+        # restrictions on unprivileged users reading the kernel
+        set_kernel_config CONFIG_SECURITY_DMESG_RESTRICT=y
+
+        # network security hooks
+        set_kernel_config CONFIG_SECURITY_NETWORK y
+        set_kernel_config CONFIG_SECURITY_NETWORK_XFRM=y
+        set_kernel_config CONFIG_SECURITY_PATH=y
+        set_kernel_config CONFIG_SECURITY_YAMA=y
+
+        # New Options
+        if [ "$KERNEL_NF" = true ] ; then
+          set_kernel_config CONFIG_IP_NF_SECURITY m
+          set_kernel_config CONFIG_NETLABEL y
+          set_kernel_config CONFIG_IP6_NF_SECURITY m
+        fi
+        set_kernel_config CONFIG_SECURITY_SELINUX n
+        set_kernel_config CONFIG_SECURITY_SMACK n
+        set_kernel_config CONFIG_SECURITY_TOMOYO n
+        set_kernel_config CONFIG_SECURITY_APPARMOR_DEBUG n
+        set_kernel_config CONFIG_SECURITY_LOADPIN n
+        set_kernel_config CONFIG_HARDENED_USERCOPY_PAGESPAN n
+        set_kernel_config CONFIG_IMA n
+        set_kernel_config CONFIG_EVM n
+        set_kernel_config CONFIG_FANOTIFY_ACCESS_PERMISSIONS y
+        set_kernel_config CONFIG_NFSD_V4_SECURITY_LABEL y
+        set_kernel_config CONFIG_PKCS7_MESSAGE_PARSER y
+        set_kernel_config CONFIG_SYSTEM_TRUSTED_KEYRING y
+        set_kernel_config CONFIG_SYSTEM_TRUSTED_KEYS y
+        set_kernel_config CONFIG_SYSTEM_EXTRA_CERTIFICATE y
+        set_kernel_config CONFIG_SECONDARY_TRUSTED_KEYRING y
+        set_kernel_config CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY n
+		set_kernel_config CONFIG_SYSTEM_TRUSTED_KEYS m
+		set_kernel_config CONFIG_SYSTEM_EXTRA_CERTIFICATE_SIZE 4096
+
+        set_kernel_config CONFIG_ARM64_CRYPTO y
+        set_kernel_config CONFIG_CRYPTO_SHA256_ARM64 m
+        set_kernel_config CONFIG_CRYPTO_SHA512_ARM64 m
+        set_kernel_config CONFIG_CRYPTO_SHA1_ARM64_CE m
+        set_kernel_config CRYPTO_GHASH_ARM64_CE m
+        set_kernel_config CRYPTO_SHA2_ARM64_CE m
+        set_kernel_config CONFIG_CRYPTO_CRCT10DIF_ARM64_CE m
+        set_kernel_config CONFIG_CRYPTO_CRC32_ARM64_CE m
+        set_kernel_config CONFIG_CRYPTO_AES_ARM64 m
+        set_kernel_config CONFIG_CRYPTO_AES_ARM64_CE m
+        set_kernel_config CONFIG_CRYPTO_AES_ARM64_CE_CCM y
+        set_kernel_config CONFIG_CRYPTO_AES_ARM64_CE_BLK y
+        set_kernel_config CONFIG_CRYPTO_AES_ARM64_NEON_BLK m
+        set_kernel_config CONFIG_CRYPTO_CHACHA20_NEON m
+        set_kernel_config CONFIG_CRYPTO_AES_ARM64_BS m
+		set_kernel_config SYSTEM_TRUSTED_KEYS
+      fi
+
+      # Netfilter kernel support See https://github.com/raspberrypi/linux/issues/2177#issuecomment-354647406
+      if [ "$KERNEL_NF" = true ] ; then
+        set_kernel_config CONFIG_IP_NF_TARGET_SYNPROXY m
+        set_kernel_config CONFIG_NETFILTER_XT_TARGET_AUDIT m
+        set_kernel_config CONFIG_NETFILTER_XT_MATCH_CGROUP m
+        set_kernel_config CONFIG_NETFILTER_XT_MATCH_IPCOMP m
+        set_kernel_config CONFIG_NETFILTER_XT_MATCH_SOCKET m
+        set_kernel_config CONFIG_NFT_FIB_INET m
+        set_kernel_config CONFIG_NFT_FIB_IPV4 m
+        set_kernel_config CONFIG_NFT_FIB_IPV6 m
+        set_kernel_config CONFIG_NFT_FIB_NETDEV m
+        set_kernel_config CONFIG_NFT_OBJREF m
+        set_kernel_config CONFIG_NFT_RT m
+        set_kernel_config CONFIG_NFT_SET_BITMAP m
+        set_kernel_config CONFIG_NF_CONNTRACK_TIMEOUT y
+        set_kernel_config CONFIG_NF_LOG_ARP m
+        set_kernel_config CONFIG_NF_SOCKET_IPV4 m
+        set_kernel_config CONFIG_NF_SOCKET_IPV6 m
+        set_kernel_config CONFIG_BRIDGE_EBT_BROUTE m
+        set_kernel_config CONFIG_BRIDGE_EBT_T_FILTER m
+        set_kernel_config CONFIG_BRIDGE_NF_EBTABLES m
+        set_kernel_config CONFIG_IP6_NF_IPTABLES m
+        set_kernel_config CONFIG_IP6_NF_MATCH_AH m
+        set_kernel_config CONFIG_IP6_NF_MATCH_EUI64 m
+        set_kernel_config CONFIG_IP6_NF_NAT m
+        set_kernel_config CONFIG_IP6_NF_TARGET_MASQUERADE m
+        set_kernel_config CONFIG_IP6_NF_TARGET_NPT m
+        set_kernel_config CONFIG_IP_NF_SECURITY m
+        set_kernel_config CONFIG_IP_SET_BITMAP_IPMAC m
+        set_kernel_config CONFIG_IP_SET_BITMAP_PORT m
+        set_kernel_config CONFIG_IP_SET_HASH_IP m
+        set_kernel_config CONFIG_IP_SET_HASH_IPMARK m
+        set_kernel_config CONFIG_IP_SET_HASH_IPPORT m
+        set_kernel_config CONFIG_IP_SET_HASH_IPPORTIP m
+        set_kernel_config CONFIG_IP_SET_HASH_IPPORTNET m
+        set_kernel_config CONFIG_IP_SET_HASH_MAC m
+        set_kernel_config CONFIG_IP_SET_HASH_NET m
+        set_kernel_config CONFIG_IP_SET_HASH_NETIFACE m
+        set_kernel_config CONFIG_IP_SET_HASH_NETNET m
+        set_kernel_config CONFIG_IP_SET_HASH_NETPORT m
+        set_kernel_config CONFIG_IP_SET_HASH_NETPORTNET m
+        set_kernel_config CONFIG_IP_SET_LIST_SET m
+        set_kernel_config CONFIG_NETFILTER_XTABLES m
+        set_kernel_config CONFIG_NETFILTER_XTABLES m
+        set_kernel_config CONFIG_NFT_BRIDGE_META m
+        set_kernel_config CONFIG_NFT_BRIDGE_REJECT m
+        set_kernel_config CONFIG_NFT_CHAIN_NAT_IPV4 m
+        set_kernel_config CONFIG_NFT_CHAIN_NAT_IPV6 m
+        set_kernel_config CONFIG_NFT_CHAIN_ROUTE_IPV4 m
+        set_kernel_config CONFIG_NFT_CHAIN_ROUTE_IPV6 m
+        set_kernel_config CONFIG_NFT_COMPAT m
+        set_kernel_config CONFIG_NFT_COUNTER m
+        set_kernel_config CONFIG_NFT_CT m
+        set_kernel_config CONFIG_NFT_DUP_IPV4 m
+        set_kernel_config CONFIG_NFT_DUP_IPV6 m
+        set_kernel_config CONFIG_NFT_DUP_NETDEV m
+        set_kernel_config CONFIG_NFT_EXTHDR m
+        set_kernel_config CONFIG_NFT_FWD_NETDEV m
+        set_kernel_config CONFIG_NFT_HASH m
+        set_kernel_config CONFIG_NFT_LIMIT m
+        set_kernel_config CONFIG_NFT_LOG m
+        set_kernel_config CONFIG_NFT_MASQ m
+        set_kernel_config CONFIG_NFT_MASQ_IPV4 m
+        set_kernel_config CONFIG_NFT_MASQ_IPV6 m
+        set_kernel_config CONFIG_NFT_META m
+        set_kernel_config CONFIG_NFT_NAT m
+        set_kernel_config CONFIG_NFT_NUMGEN m
+        set_kernel_config CONFIG_NFT_QUEUE m
+        set_kernel_config CONFIG_NFT_QUOTA m
+        set_kernel_config CONFIG_NFT_REDIR m
+        set_kernel_config CONFIG_NFT_REDIR_IPV4 m
+        set_kernel_config CONFIG_NFT_REDIR_IPV6 m
+        set_kernel_config CONFIG_NFT_REJECT m
+        set_kernel_config CONFIG_NFT_REJECT_INET m
+        set_kernel_config CONFIG_NFT_REJECT_IPV4 m
+        set_kernel_config CONFIG_NFT_REJECT_IPV6 m
+        set_kernel_config CONFIG_NFT_SET_HASH m
+        set_kernel_config CONFIG_NFT_SET_RBTREE m
+        set_kernel_config CONFIG_NF_CONNTRACK_IPV4 m
+        set_kernel_config CONFIG_NF_CONNTRACK_IPV6 m
+        set_kernel_config CONFIG_NF_DEFRAG_IPV4 m
+        set_kernel_config CONFIG_NF_DEFRAG_IPV6 m
+        set_kernel_config CONFIG_NF_DUP_IPV4 m
+        set_kernel_config CONFIG_NF_DUP_IPV6 m
+        set_kernel_config CONFIG_NF_DUP_NETDEV m
+        set_kernel_config CONFIG_NF_LOG_BRIDGE m
+        set_kernel_config CONFIG_NF_LOG_IPV4 m
+        set_kernel_config CONFIG_NF_LOG_IPV6 m
+        set_kernel_config CONFIG_NF_NAT_IPV4 m
+        set_kernel_config CONFIG_NF_NAT_IPV6 m
+        set_kernel_config CONFIG_NF_NAT_MASQUERADE_IPV4 m
+        set_kernel_config CONFIG_NF_NAT_MASQUERADE_IPV6 m
+        set_kernel_config CONFIG_NF_NAT_PPTP m
+        set_kernel_config CONFIG_NF_NAT_PROTO_GRE m
+        set_kernel_config CONFIG_NF_NAT_REDIRECT m
+        set_kernel_config CONFIG_NF_NAT_SIP m
+        set_kernel_config CONFIG_NF_NAT_SNMP_BASIC m
+        set_kernel_config CONFIG_NF_NAT_TFTP m
+        set_kernel_config CONFIG_NF_REJECT_IPV4 m
+        set_kernel_config CONFIG_NF_REJECT_IPV6 m
+        set_kernel_config CONFIG_NF_TABLES m
+        set_kernel_config CONFIG_NF_TABLES_ARP m
+        set_kernel_config CONFIG_NF_TABLES_BRIDGE m
+        set_kernel_config CONFIG_NF_TABLES_INET m
+        set_kernel_config CONFIG_NF_TABLES_IPV4 m
+        set_kernel_config CONFIG_NF_TABLES_IPV6 m
+        set_kernel_config CONFIG_NF_TABLES_NETDEV m
+      fi
+
+	  # Enables BPF syscall for systemd-journald see https://github.com/torvalds/linux/blob/master/init/Kconfig#L848 or https://groups.google.com/forum/#!topic/linux.gentoo.user/_2aSc_ztGpA
+	  if [ "$KERNEL_BPF" = true ] ; then
+        set_kernel_config CONFIG_BPF_SYSCALL y
+		set_kernel_config CONFIG_BPF_EVENTS y
+		set_kernel_config CONFIG_BPF_STREAM_PARSER y
+	    set_kernel_config CONFIG_CGROUP_BPF y
+	  fi
+
+	  # KERNEL_DEFAULT_GOV was set by user 
+	  if [ "$KERNEL_DEFAULT_GOV" != powersave ] && [ -n "$KERNEL_DEFAULT_GOV" ] ; then
+
+	    case "$KERNEL_DEFAULT_GOV" in
+          performance)
+	        set_kernel_config CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE y
+            ;;
+          userspace)
+            set_kernel_config CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE y
+            ;;
+          ondemand)
+		    set_kernel_config CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND y
+            ;;
+          conservative)
+		    set_kernel_config CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE y
+		    ;;
+          shedutil)
+		    set_kernel_config CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL y
+            ;;
+          *)
+            echo "error: unsupported default cpu governor"
+            exit 1
+            ;;
+        esac
+
+            # unset previous default governor
+	    unset_kernel_config CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
+	  fi
+
+	  #Revert to previous directory
+	  cd "${WORKDIR}" || exit
+
       # Set kernel configuration parameters to enable qemu emulation
       if [ "$ENABLE_QEMU" = true ] ; then
         echo "CONFIG_FHANDLE=y" >> "${KERNEL_DIR}"/.config
@@ -126,6 +411,7 @@ if [ "$BUILD_KERNEL" = true ] ; then
       if [ "$KERNEL_MENUCONFIG" = true ] ; then
         make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" menuconfig
       fi
+	# end if "$KERNELSRC_CONFIG" = true
     fi
 
     # Use ccache to cross compile the kernel
@@ -142,6 +428,7 @@ if [ "$BUILD_KERNEL" = true ] ; then
     if grep -q "CONFIG_MODULES=y" "${KERNEL_DIR}/.config" ; then
       make -C "${KERNEL_DIR}" -j"${KERNEL_THREADS}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" CC="${cc}" modules
     fi
+  # end if "$KERNELSRC_PREBUILT" = false
   fi
 
   # Check if kernel compilation was successful
@@ -237,19 +524,79 @@ if [ "$BUILD_KERNEL" = true ] ; then
   fi
 
 else # BUILD_KERNEL=false
-  # Kernel installation
-  chroot_exec apt-get -qq -y --no-install-recommends install linux-image-"${COLLABORA_KERNEL}" raspberrypi-bootloader-nokernel
+  if [ "$SET_ARCH" = 64 ] && { [ "$RPI_MODEL" = 3 ] || [ "$RPI_MODEL" = 3P ] ; } ; then
+
+	# Use Sakakis modified kernel if ZSWAP is active
+    if [ "$KERNEL_ZSWAP" = true ] || [ "$KERNEL_VIRT" = true ] || [ "$KERNEL_NF" = true ] || [ "$KERNEL_BPF" = true ] ; then
+	  RPI3_64_KERNEL_URL="${RPI3_64_BIS_KERNEL_URL}"
+	fi
+
+    # Create temporary directory for dl
+    temp_dir=$(as_nobody mktemp -d)
+
+    # Fetch kernel dl
+    as_nobody wget -O "${temp_dir}"/kernel.tar.xz -c "$RPI3_64_KERNEL_URL" 
+
+    #extract download
+    tar -xJf "${temp_dir}"/kernel.tar.xz -C "${temp_dir}"
+
+    #move extracted kernel to /boot/firmware
+    mkdir "${R}/boot/firmware"
+    cp "${temp_dir}"/boot/* "${R}"/boot/firmware/
+    cp -r "${temp_dir}"/lib/* "${R}"/lib/
+
+    # Remove temporary directory for kernel sources
+    rm -fr "${temp_dir}"
+
+    # Set permissions of the kernel sources
+    chown -R root:root "${R}/boot/firmware"
+    chown -R root:root "${R}/lib/modules"
+  fi
+
+  # Install Kernel from hypriot comptabile with all Raspberry PI
+  if [ "$SET_ARCH" = 32 ] ; then
+    # Create temporary directory for dl
+    temp_dir=$(as_nobody mktemp -d)
+
+    # Fetch kernel
+    as_nobody wget -O "${temp_dir}"/kernel.deb -c "$RPI_32_KERNEL_URL"
 
-  # Install flash-kernel last so it doesn't try (and fail) to detect the platform in the chroot
-  chroot_exec apt-get -qq -y install flash-kernel
+    # Copy downloaded U-Boot sources
+    mv "${temp_dir}"/kernel.deb "${R}"/tmp/kernel.deb
+
+    # Set permissions
+    chown -R root:root "${R}"/tmp/kernel.deb
+
+	# Install kernel
+	chroot_exec dpkg -i /tmp/kernel.deb
+
+	# move /boot to /boot/firmware to fit script env.
+	#mkdir "${BOOT_DIR}"
+	mkdir "${temp_dir}"/firmware
+	mv  "${R}"/boot/* "${temp_dir}"/firmware/
+	mv "${temp_dir}"/firmware "${R}"/boot/
+
+	#same for kernel headers
+	if [ "$KERNEL_HEADERS" = true ] ; then
+	  # Fetch kernel header
+	  as_nobody wget -O "${temp_dir}"/kernel-header.deb -c "$RPI_32_KERNELHEADER_URL"
+	  mv "${temp_dir}"/kernel-header.deb "${R}"/tmp/kernel-header.deb
+	  chown -R root:root "${R}"/tmp/kernel-header.deb
+	  # Install kernel header
+	  chroot_exec dpkg -i /tmp/kernel-header.deb
+	  rm -f "${R}"/tmp/kernel-header.deb
+	fi
+
+    # Remove temporary directory and files
+    rm -fr "${temp_dir}"
+	rm -f "${R}"/tmp/kernel.deb
+  fi
 
   # Check if kernel installation was successful
-  VMLINUZ="$(ls -1 "${R}"/boot/vmlinuz-* | sort | tail -n 1)"
-  if [ -z "$VMLINUZ" ] ; then
-    echo "error: kernel installation failed! (/boot/vmlinuz-* not found)"
+  KERNEL="$(ls -1 "${R}"/boot/firmware/kernel* | sort | tail -n 1)"
+  if [ -z "$KERNEL" ] ; then
+    echo "error: kernel installation failed! (/boot/kernel* not found)"
     cleanup
     exit 1
   fi
-  # Copy vmlinuz kernel to the boot directory
-  install_readonly "${VMLINUZ}" "${BOOT_DIR}/${KERNEL_IMAGE}"
 fi
diff --git a/bootstrap.d/14-fstab.sh b/bootstrap.d/14-fstab.sh
index 2f68cdf..4ecba25 100644
--- a/bootstrap.d/14-fstab.sh
+++ b/bootstrap.d/14-fstab.sh
@@ -8,6 +8,11 @@
 # Install and setup fstab
 install_readonly files/mount/fstab "${ETC_DIR}/fstab"
 
+if [ "$ENABLE_UBOOTUSB" = true ] ; then
+  sed -i "s/mmcblk0p1/sda1/" "${ETC_DIR}/fstab"
+  sed -i "s/mmcblk0p2/sda2/" "${ETC_DIR}/fstab"
+fi
+
 # Add usb/sda disk root partition to fstab
 if [ "$ENABLE_SPLITFS" = true ] && [ "$ENABLE_CRYPTFS" = false ] ; then
   sed -i "s/mmcblk0p2/sda1/" "${ETC_DIR}/fstab"
@@ -29,7 +34,7 @@ if [ "$ENABLE_CRYPTFS" = true ] ; then
 fi
 
 # Generate initramfs file
-if [ "$BUILD_KERNEL" = true ] && [ "$ENABLE_INITRAMFS" = true ] ; then
+if [ "$ENABLE_INITRAMFS" = true ] ; then
   if [ "$ENABLE_CRYPTFS" = true ] ; then
     # Include initramfs scripts to auto expand encrypted root partition
     if [ "$EXPANDROOT" = true ] ; then
@@ -38,8 +43,43 @@ if [ "$BUILD_KERNEL" = true ] && [ "$ENABLE_INITRAMFS" = true ] ; then
       install_exec files/initramfs/expand-tools "${ETC_DIR}/initramfs-tools/hooks/expand-tools"
     fi
 
-    # Disable SSHD inside initramfs
-    printf "#\n# DROPBEAR: [ y | n ]\n#\n\nDROPBEAR=n\n" >> "${ETC_DIR}/initramfs-tools/initramfs.conf"
+	if [ "$CRYPTFS_DROPBEAR" = true ]; then
+		if [ -n "$CRYPTFS_DROPBEAR_PUBKEY" ] && [ -f "$CRYPTFS_DROPBEAR_PUBKEY" ] ; then
+ 			install_readonly "${CRYPTFS_DROPBEAR_PUBKEY}" "${ETC_DIR}"/dropbear-initramfs/id_rsa.pub
+ 			cat "${ETC_DIR}"/dropbear-initramfs/id_rsa.pub >> "${ETC_DIR}"/dropbear-initramfs/authorized_keys
+ 		else
+  		  # Create key
+ 		  chroot_exec /usr/bin/dropbearkey -t rsa -f /etc/dropbear-initramfs/id_rsa.dropbear
+
+ 		  # Convert dropbear key to openssh key
+ 		  chroot_exec /usr/lib/dropbear/dropbearconvert dropbear openssh /etc/dropbear-initramfs/id_rsa.dropbear /etc/dropbear-initramfs/id_rsa
+
+		  # Get Public Key Part
+ 		  chroot_exec /usr/bin/dropbearkey -y -f /etc/dropbear-initramfs/id_rsa.dropbear | chroot_exec tee /etc/dropbear-initramfs/id_rsa.pub
+
+		  # Delete unwanted lines
+ 		  sed -i '/Public/d' "${ETC_DIR}"/dropbear-initramfs/id_rsa.pub
+ 		  sed -i '/Fingerprint/d' "${ETC_DIR}"/dropbear-initramfs/id_rsa.pub
+
+		  # Trust the new key
+ 		  cat "${ETC_DIR}"/dropbear-initramfs/id_rsa.pub > "${ETC_DIR}"/dropbear-initramfs/authorized_keys
+
+          # Save Keys - convert with putty from rsa/openssh to puttkey
+          cp -f "${ETC_DIR}"/dropbear-initramfs/id_rsa "${BASEDIR}"/dropbear_initramfs_key.rsa
+
+		  # Get unlock script
+ 		  install_exec files/initramfs/crypt_unlock.sh "${ETC_DIR}"/initramfs-tools/hooks/crypt_unlock.sh
+
+		  # Enable Dropbear inside initramfs
+	      printf "#\n# DROPBEAR: [ y | n ]\n#\n\nDROPBEAR=y\n" >> "${ETC_DIR}/initramfs-tools/initramfs.conf"
+
+	      # Enable Dropbear inside initramfs
+	      sed -i "54 i sleep 5" "${R}"/usr/share/initramfs-tools/scripts/init-premount/dropbear	  
+		fi
+	else
+	  # Disable SSHD inside initramfs
+	  printf "#\n# DROPBEAR: [ y | n ]\n#\n\nDROPBEAR=n\n" >> "${ETC_DIR}/initramfs-tools/initramfs.conf"
+	fi
 
     # Add cryptsetup modules to initramfs
     printf "#\n# CRYPTSETUP: [ y | n ]\n#\n\nCRYPTSETUP=y\n" >> "${ETC_DIR}/initramfs-tools/conf-hook"
diff --git a/bootstrap.d/15-rpi-config.sh b/bootstrap.d/15-rpi-config.sh
index eda69bd..4510e83 100644
--- a/bootstrap.d/15-rpi-config.sh
+++ b/bootstrap.d/15-rpi-config.sh
@@ -5,39 +5,37 @@
 # Load utility functions
 . ./functions.sh
 
-if [ "$BUILD_KERNEL" = true ] ; then
-  if [ -n "$RPI_FIRMWARE_DIR" ] && [ -d "$RPI_FIRMWARE_DIR" ] ; then
-    # Install boot binaries from local directory
-    cp "${RPI_FIRMWARE_DIR}"/boot/bootcode.bin "${BOOT_DIR}"/bootcode.bin
-    cp "${RPI_FIRMWARE_DIR}"/boot/fixup.dat "${BOOT_DIR}"/fixup.dat
-    cp "${RPI_FIRMWARE_DIR}"/boot/fixup_cd.dat "${BOOT_DIR}"/fixup_cd.dat
-    cp "${RPI_FIRMWARE_DIR}"/boot/fixup_x.dat "${BOOT_DIR}"/fixup_x.dat
-    cp "${RPI_FIRMWARE_DIR}"/boot/start.elf "${BOOT_DIR}"/start.elf
-    cp "${RPI_FIRMWARE_DIR}"/boot/start_cd.elf "${BOOT_DIR}"/start_cd.elf
-    cp "${RPI_FIRMWARE_DIR}"/boot/start_x.elf "${BOOT_DIR}"/start_x.elf
-  else
-    # Create temporary directory for boot binaries
-    temp_dir=$(as_nobody mktemp -d)
-
-    # Install latest boot binaries from raspberry/firmware github
-    as_nobody wget -q -O "${temp_dir}/bootcode.bin" "${FIRMWARE_URL}/bootcode.bin"
-    as_nobody wget -q -O "${temp_dir}/fixup.dat" "${FIRMWARE_URL}/fixup.dat"
-    as_nobody wget -q -O "${temp_dir}/fixup_cd.dat" "${FIRMWARE_URL}/fixup_cd.dat"
-    as_nobody wget -q -O "${temp_dir}/fixup_x.dat" "${FIRMWARE_URL}/fixup_x.dat"
-    as_nobody wget -q -O "${temp_dir}/start.elf" "${FIRMWARE_URL}/start.elf"
-    as_nobody wget -q -O "${temp_dir}/start_cd.elf" "${FIRMWARE_URL}/start_cd.elf"
-    as_nobody wget -q -O "${temp_dir}/start_x.elf" "${FIRMWARE_URL}/start_x.elf"
-
-    # Move downloaded boot binaries
-    mv "${temp_dir}/"* "${BOOT_DIR}/"
-
-    # Remove temporary directory for boot binaries
-    rm -fr "${temp_dir}"
-
-    # Set permissions of the boot binaries
-    chown -R root:root "${BOOT_DIR}"
-    chmod -R 600 "${BOOT_DIR}"
-  fi
+if [ -n "$RPI_FIRMWARE_DIR" ] && [ -d "$RPI_FIRMWARE_DIR" ] ; then
+  # Install boot binaries from local directory
+  cp "${RPI_FIRMWARE_DIR}"/boot/bootcode.bin "${BOOT_DIR}"/bootcode.bin
+  cp "${RPI_FIRMWARE_DIR}"/boot/fixup.dat "${BOOT_DIR}"/fixup.dat
+  cp "${RPI_FIRMWARE_DIR}"/boot/fixup_cd.dat "${BOOT_DIR}"/fixup_cd.dat
+  cp "${RPI_FIRMWARE_DIR}"/boot/fixup_x.dat "${BOOT_DIR}"/fixup_x.dat
+  cp "${RPI_FIRMWARE_DIR}"/boot/start.elf "${BOOT_DIR}"/start.elf
+  cp "${RPI_FIRMWARE_DIR}"/boot/start_cd.elf "${BOOT_DIR}"/start_cd.elf
+  cp "${RPI_FIRMWARE_DIR}"/boot/start_x.elf "${BOOT_DIR}"/start_x.elf
+else
+  # Create temporary directory for boot binaries
+  temp_dir=$(as_nobody mktemp -d)
+
+  # Install latest boot binaries from raspberry/firmware github
+  as_nobody wget -q -O "${temp_dir}/bootcode.bin" "${FIRMWARE_URL}/bootcode.bin"
+  as_nobody wget -q -O "${temp_dir}/fixup.dat" "${FIRMWARE_URL}/fixup.dat"
+  as_nobody wget -q -O "${temp_dir}/fixup_cd.dat" "${FIRMWARE_URL}/fixup_cd.dat"
+  as_nobody wget -q -O "${temp_dir}/fixup_x.dat" "${FIRMWARE_URL}/fixup_x.dat"
+  as_nobody wget -q -O "${temp_dir}/start.elf" "${FIRMWARE_URL}/start.elf"
+  as_nobody wget -q -O "${temp_dir}/start_cd.elf" "${FIRMWARE_URL}/start_cd.elf"
+  as_nobody wget -q -O "${temp_dir}/start_x.elf" "${FIRMWARE_URL}/start_x.elf"
+
+  # Move downloaded boot binaries
+  mv "${temp_dir}/"* "${BOOT_DIR}/"
+
+  # Remove temporary directory for boot binaries
+  rm -fr "${temp_dir}"
+
+  # Set permissions of the boot binaries
+  chown -R root:root "${BOOT_DIR}"
+  chmod -R 600 "${BOOT_DIR}"
 fi
 
 # Setup firmware boot cmdline
@@ -56,23 +54,53 @@ if [ "$ENABLE_CRYPTFS" = true ] ; then
   fi
 fi
 
-#locks cpu at max frequency
-if [ "$ENABLE_TURBO" = true ] ; then
-  echo "force_turbo=1" >> "${BOOT_DIR}/config.txt"
-fi
-
+# Enable Kernel messages on standard output
 if [ "$ENABLE_PRINTK" = true ] ; then
   install_readonly files/sysctl.d/83-rpi-printk.conf "${ETC_DIR}/sysctl.d/83-rpi-printk.conf"
 fi
 
-# Install udev rule for serial alias
+# Install udev rule for serial alias - serial0 = console serial1=bluetooth
 install_readonly files/etc/99-com.rules "${LIB_DIR}/udev/rules.d/99-com.rules"
 
+# Remove IPv6 networking support
+if [ "$ENABLE_IPV6" = false ] ; then
+  CMDLINE="${CMDLINE} ipv6.disable=1"
+fi
+
+# Automatically assign predictable network interface names
+if [ "$ENABLE_IFNAMES" = false ] ; then
+  CMDLINE="${CMDLINE} net.ifnames=0"
+else
+  CMDLINE="${CMDLINE} net.ifnames=1"
+fi
+
+# Disable Raspberry Pi console logo
+if [ "$ENABLE_LOGO" = false ] ; then
+  CMDLINE="${CMDLINE} logo.nologo"
+fi
+
+# Strictly limit verbosity of boot up console messages
+if [ "$ENABLE_SILENT_BOOT" = true ] ; then
+  CMDLINE="${CMDLINE} quiet loglevel=0 rd.systemd.show_status=auto rd.udev.log_priority=0"
+fi
+
+# Install firmware config
+install_readonly files/boot/config.txt "${BOOT_DIR}/config.txt"
+
+# Disable Raspberry Pi console logo
+if [ "$ENABLE_SLASH" = false ] ; then
+  echo "disable_splash=1" >> "${BOOT_DIR}/config.txt"
+fi
+
+# Locks CPU frequency at maximum
+if [ "$ENABLE_TURBO" = true ] ; then
+  echo "force_turbo=1" >> "${BOOT_DIR}/config.txt"
+  # helps to avoid sdcard corruption when force_turbo is enabled.
+  echo "boot_delay=1" >> "${BOOT_DIR}/config.txt"
+fi
+
 if [ "$RPI_MODEL" = 0 ] || [ "$RPI_MODEL" = 3 ] || [ "$RPI_MODEL" = 3P ] ; then
-  
-  # RPI0,3,3P Use default ttyS0 (mini-UART)as serial interface
-  SET_SERIAL="ttyS0"
-  
+
   # Bluetooth enabled
   if [ "$ENABLE_BLUETOOTH" = true ] ; then
     # Create temporary directory for Bluetooth sources
@@ -95,6 +123,10 @@ if [ "$RPI_MODEL" = 0 ] || [ "$RPI_MODEL" = 3 ] || [ "$RPI_MODEL" = 3P ] ; then
     install_readonly "${R}/tmp/pi-bluetooth/usr/bin/btuart" "${R}/usr/bin/btuart"
     install_readonly "${R}/tmp/pi-bluetooth/usr/bin/bthelper" "${R}/usr/bin/bthelper"
 
+	# make scripts executable
+	chmod +x "${R}/usr/bin/bthelper"
+	chmod +x "${R}/usr/bin/btuart"
+
     # Install bluetooth udev rule
     install_readonly "${R}/tmp/pi-bluetooth/lib/udev/rules.d/90-pi-bluetooth.rules" "${LIB_DIR}/udev/rules.d/90-pi-bluetooth.rules"
 
@@ -104,13 +136,13 @@ if [ "$RPI_MODEL" = 0 ] || [ "$RPI_MODEL" = 3 ] || [ "$RPI_MODEL" = 3P ] ; then
     install_readonly "${R}/tmp/pi-bluetooth/BCM43430A1.hcd" "${BLUETOOTH_FIRMWARE_DIR}/LICENCE.broadcom_bcm43xx"
     install_readonly "${R}/tmp/pi-bluetooth/debian/pi-bluetooth.bthelper@.service" "${ETC_DIR}/systemd/system/pi-bluetooth.bthelper@.service"
     install_readonly "${R}/tmp/pi-bluetooth/debian/pi-bluetooth.hciuart.service" "${ETC_DIR}/systemd/system/pi-bluetooth.hciuart.service"
-	
-    # Remove temporary directory
+
+    # Remove temporary directories
     rm -fr "${temp_dir}"
-	
+	rm -fr "${R}"/tmp/pi-bluetooth
+
     # Switch Pi3 Bluetooth function to use the mini-UART (ttyS0) and restore UART0/ttyAMA0 over GPIOs 14 & 15. Slow Bluetooth and slow cpu. Use /dev/ttyS0 instead of /dev/ttyAMA0
     if [ "$ENABLE_MINIUART_OVERLAY" = true ] ; then
-	  SET_SERIAL="ttyAMA0"
 
 	  # set overlay to swap ttyAMA0 and ttyS0
       echo "dtoverlay=pi3-miniuart-bt" >> "${BOOT_DIR}/config.txt"
@@ -119,23 +151,15 @@ if [ "$RPI_MODEL" = 0 ] || [ "$RPI_MODEL" = 3 ] || [ "$RPI_MODEL" = 3P ] ; then
 	  if [ "$ENABLE_TURBO" = false ] ; then 
 	    echo "core_freq=250" >> "${BOOT_DIR}/config.txt"
 	  fi
-	  
-	  # Activate services
-	  chroot_exec systemctl enable pi-bluetooth.hciuart.service
-	  #chroot_exec systemctl enable pi-bluetooth.bthelper@.service
-	else
-	  chroot_exec systemctl enable pi-bluetooth.hciuart.service
-	  #chroot_exec systemctl enable pi-bluetooth.bthelper@.service
 	fi
-	
+
+	# Activate services
+	chroot_exec systemctl enable pi-bluetooth.hciuart.service
+
   else # if ENABLE_BLUETOOTH = false
   	# set overlay to disable bluetooth
     echo "dtoverlay=pi3-disable-bt" >> "${BOOT_DIR}/config.txt"
   fi # ENABLE_BLUETOOTH end
-
-else
-  # RPI1,1P,2 Use default ttyAMA0 (full UART) as serial interface
-  SET_SERIAL="ttyAMA0"
 fi
 
 # may need sudo systemctl disable hciuart
@@ -143,33 +167,60 @@ if [ "$ENABLE_CONSOLE" = true ] ; then
   echo "enable_uart=1"  >> "${BOOT_DIR}/config.txt" 
   # add string to cmdline
   CMDLINE="${CMDLINE} console=serial0,115200"
-	  
+
   # Enable serial console systemd style
-  chroot_exec systemctl enable serial-getty\@"$SET_SERIAL".service
+  chroot_exec systemctl enable serial-getty\@serial0.service
 else
   echo "enable_uart=0"  >> "${BOOT_DIR}/config.txt"
+  
   # disable serial console systemd style
   chroot_exec systemctl disable serial-getty\@"$SET_SERIAL".service
 fi
 
-# Remove IPv6 networking support
-if [ "$ENABLE_IPV6" = false ] ; then
-  CMDLINE="${CMDLINE} ipv6.disable=1"
-fi
+if [ "$ENABLE_SYSTEMDSWAP" = true ] ; then
+  # Create temporary directory for systemd-swap sources
+  temp_dir=$(as_nobody mktemp -d)
 
-# Automatically assign predictable network interface names
-if [ "$ENABLE_IFNAMES" = false ] ; then
-  CMDLINE="${CMDLINE} net.ifnames=0"
+  # Fetch systemd-swap sources
+  as_nobody git -C "${temp_dir}" clone "${SYSTEMDSWAP_URL}"
+
+  # Copy downloaded systemd-swap sources
+  mv "${temp_dir}/systemd-swap" "${R}/tmp/"
+
+  # Set permissions of the systemd-swap sources
+  chown -R root:root "${R}/tmp/systemd-swap"
+
+  # Remove temporary directory for systemd-swap sources
+  rm -fr "${temp_dir}"
+  
+  # Change into downloaded src dir
+  cd "${R}/tmp/systemd-swap" || exit
+  
+  # Build package
+  . ./package.sh debian
+  
+  # Install package
+  chroot_exec dpkg -i /tmp/systemd-swap/systemd-swap-*any.deb
+  
+  # Enable service
+  chroot_exec systemctl enable systemd-swap
+  
+  # Change back into script root dir
+  cd "${WORKDIR}" || exit
 else
-  CMDLINE="${CMDLINE} net.ifnames=1"
+  # Enable ZSWAP in cmdline if systemd-swap is not used
+  if [ "$KERNEL_ZSWAP" = true ] ; then
+    CMDLINE="${CMDLINE} zswap.enabled=1 zswap.max_pool_percent=25 zswap.compressor=lz4" 
+  fi
+fi
+
+if [ "$KERNEL_SECURITY" = true ] ; then
+  CMDLINE="${CMDLINE} apparmor=1 security=apparmor" 
 fi
 
 # Install firmware boot cmdline
 echo "${CMDLINE}" > "${BOOT_DIR}/cmdline.txt"
 
-# Install firmware config
-install_readonly files/boot/config.txt "${BOOT_DIR}/config.txt"
-
 # Setup minimal GPU memory allocation size: 16MB (no X)
 if [ "$ENABLE_MINGPU" = true ] ; then
   echo "gpu_mem=16" >> "${BOOT_DIR}/config.txt"
diff --git a/bootstrap.d/20-networking.sh b/bootstrap.d/20-networking.sh
index 3aca05f..4e001fe 100644
--- a/bootstrap.d/20-networking.sh
+++ b/bootstrap.d/20-networking.sh
@@ -57,6 +57,20 @@ else # ENABLE_DHCP=false
   -e "0,/NTP=\$/ s|NTP=\$|NTP=${NET_NTP_1}|"\
   -e "0,/NTP=\$/ s|NTP=\$|NTP=${NET_NTP_2}|"\
   "${ETC_DIR}/systemd/network/eth.network"
+  
+  if [ "$CRYPTFS_DROPBEAR" = true ] ; then
+    # Get cdir from NET_ADDRESS e.g. 24
+    cdir=$(${NET_ADDRESS} | cut -d '/' -f2)
+
+    # Convert cdir ro netmask e.g. 24 to 255.255.255.0
+    NET_MASK=$(cdr2mask "$cdir")
+	
+	# Write static ip settings to "${ETC_DIR}"/initramfs-tools/initramfs.conf
+    sed -i "\$aIP=${NET_ADDRESS}::${NET_GATEWAY}:${NET_MASK}:${HOSTNAME}:" "${ETC_DIR}"/initramfs-tools/initramfs.conf
+
+	# Regenerate initramfs
+	chroot_exec mkinitramfs -o "/boot/firmware/initramfs-${KERNEL_VERSION}" "${KERNEL_VERSION}"
+  fi
 fi
 
 # Remove empty settings from network configuration
diff --git a/bootstrap.d/21-firewall.sh b/bootstrap.d/21-firewall.sh
index e6033c4..91b6e26 100644
--- a/bootstrap.d/21-firewall.sh
+++ b/bootstrap.d/21-firewall.sh
@@ -9,9 +9,10 @@ if [ "$ENABLE_IPTABLES" = true ] ; then
   # Create iptables configuration directory
   mkdir -p "${ETC_DIR}/iptables"
   
-  # make sure iptables-legacy is the used alternatives 
-  #iptables-save and -restore are slaves of iptables and thus are set accordingly
-  chroot_exec update-alternatives --verbose --set iptables /usr/sbin/iptables-legacy
+  if [ "$KERNEL_NF" = false ] ; then
+    #iptables-save and -restore are slaves of iptables and thus are set accordingly
+    chroot_exec update-alternatives --verbose --set iptables /usr/sbin/iptables-legacy    
+  fi
   
   # Install iptables systemd service
   install_readonly files/iptables/iptables.service "${ETC_DIR}/systemd/system/iptables.service"
@@ -27,6 +28,11 @@ if [ "$ENABLE_IPTABLES" = true ] ; then
   chroot_exec systemctl enable iptables.service
 
   if [ "$ENABLE_IPV6" = true ] ; then
+    if [ "$KERNEL_NF" = false ] ; then
+      #iptables-save and -restore are slaves of iptables and thus are set accordingly
+      chroot_exec update-alternatives --verbose --set ip6tables /usr/sbin/ip6tables-legacy 
+	  fi
+    
     # Install ip6tables systemd service
     install_readonly files/iptables/ip6tables.service "${ETC_DIR}/systemd/system/ip6tables.service"
 
diff --git a/bootstrap.d/30-security.sh b/bootstrap.d/30-security.sh
index 8ad8275..75e3625 100644
--- a/bootstrap.d/30-security.sh
+++ b/bootstrap.d/30-security.sh
@@ -22,8 +22,3 @@ else
   # Set no root password to disable root login
   chroot_exec usermod -p \'!\' root
 fi
-
-# Enable serial console systemd style
-if [ "$ENABLE_CONSOLE" = true ] ; then
-  chroot_exec systemctl enable serial-getty\@ttyAMA0.service
-fi
diff --git a/bootstrap.d/41-uboot.sh b/bootstrap.d/41-uboot.sh
index dded27d..e81dcd9 100644
--- a/bootstrap.d/41-uboot.sh
+++ b/bootstrap.d/41-uboot.sh
@@ -77,6 +77,11 @@ if [ "$ENABLE_UBOOT" = true ] ; then
     #in 64bit uboot booti is used instead of bootz [like in KERNEL_BIN_IMAGE=zImage (armv7)|| Image(armv8)]
     sed -i "s|bootz|booti|g" "${BOOT_DIR}/uboot.mkimage"
   fi
+  
+  # instead of sd, boot from usb device
+  if [ "$ENABLE_UBOOTUSB" = true ] ; then
+    sed -i "s|mmc|usb|g" "${BOOT_DIR}/uboot.mkimage"
+  fi
 
   # Set mkfile to use the correct dtb file
   sed -i "s|bcm2709-rpi-2-b.dtb|${DTB_FILE}|" "${BOOT_DIR}/uboot.mkimage"
diff --git a/bootstrap.d/43-videocore.sh b/bootstrap.d/43-videocore.sh
index b8ff518..344965c 100644
--- a/bootstrap.d/43-videocore.sh
+++ b/bootstrap.d/43-videocore.sh
@@ -50,4 +50,7 @@ if [ "$ENABLE_VIDEOCORE" = true ] ; then
 
   #back to root of scriptdir
   cd "${WORKDIR}"
+  
+  # Remove videocore sources
+  rm -fr "${R}"/tmp/userland/
 fi
diff --git a/bootstrap.d/44-nexmon_monitor_patch.sh b/bootstrap.d/44-nexmon_monitor_patch.sh
new file mode 100644
index 0000000..5a260a2
--- /dev/null
+++ b/bootstrap.d/44-nexmon_monitor_patch.sh
@@ -0,0 +1,97 @@
+#!/bin/sh
+#
+# Build and Setup nexmon with monitor mode patch
+#
+
+# Load utility functions
+. ./functions.sh
+
+if [ "$ENABLE_NEXMON" = true ] && [ "$ENABLE_WIRELESS" = true ]; then
+  # Copy existing nexmon sources into chroot directory
+  if [ -n "$NEXMONSRC_DIR" ] && [ -d "$NEXMONSRC_DIR" ] ; then
+    # Copy local U-Boot sources
+    cp -r "${NEXMONSRC_DIR}" "${R}/tmp"
+  else
+    # Create temporary directory for nexmon sources
+    temp_dir=$(as_nobody mktemp -d)
+
+    # Fetch nexmon sources
+    as_nobody git -C "${temp_dir}" clone "${NEXMON_URL}"
+
+    # Copy downloaded nexmon sources
+    mv "${temp_dir}/nexmon" "${R}"/tmp/
+
+    # Set permissions of the nexmon sources
+    chown -R root:root "${R}"/tmp/nexmon
+
+    # Remove temporary directory for nexmon sources
+    rm -fr "${temp_dir}"
+  fi
+	
+  # Set script Root
+  export NEXMON_ROOT="${R}"/tmp/nexmon
+
+  # Build nexmon firmware outside the build system, if we can.
+  cd "${NEXMON_ROOT}" || exit
+  
+  # Make ancient isl build
+  cd buildtools/isl-0.10 || exit
+  ./configure
+  make
+  cd ../.. || exit
+  
+  # Disable statistics
+  touch DISABLE_STATISTICS
+  
+  # Setup Enviroment: see https://github.com/NoobieDog/nexmon/blob/master/setup_env.sh
+  export KERNEL="${KERNEL_IMAGE}"
+  export ARCH=arm
+  export SUBARCH=arm
+  export CC="${NEXMON_ROOT}"/buildtools/gcc-arm-none-eabi-5_4-2016q2-linux-x86/bin/arm-none-eabi-
+  export CC="${CC}"gcc
+  export CCPLUGIN="${NEXMON_ROOT}"/buildtools/gcc-nexmon-plugin/nexmon.so
+  export ZLIBFLATE="zlib-flate -compress"
+  export Q=@
+  export NEXMON_SETUP_ENV=1
+  export HOSTUNAME=$(uname -s)
+  export PLATFORMUNAME=$(uname -m)
+  
+  # Make nexmon
+  make
+
+  # build patches
+  if [ "$RPI_MODEL" = 0 ] || [ "$RPI_MODEL" = 3 ] ; then
+    cd "${NEXMON_ROOT}"/patches/bcm43430a1/7_45_41_46/nexmon || exit
+	sed -i -e 's/all:.*/all: $(RAM_FILE)/g' ${NEXMON_ROOT}/patches/bcm43430a1/7_45_41_46/nexmon/Makefile
+    make clean
+	
+    # We do this so we don't have to install the ancient isl version into /usr/local/lib on systems.
+    LD_LIBRARY_PATH="${NEXMON_ROOT}"/buildtools/isl-0.10/.libs make ARCH="${KERNEL_ARCH}" CC="${NEXMON_ROOT}"/buildtools/gcc-arm-none-eabi-5_4-2016q2-linux-x86/bin/arm-none-eabi-
+	
+    # copy RPi0W & RPi3 firmware
+	mv "${WLAN_FIRMWARE_DIR}"/brcmfmac43430-sdio.bin "${WLAN_FIRMWARE_DIR}"/brcmfmac43430-sdio.org.bin
+    cp "${NEXMON_ROOT}"/patches/bcm43430a1/7_45_41_46/nexmon/brcmfmac43430-sdio.bin "${WLAN_FIRMWARE_DIR}"/brcmfmac43430-sdio.nexmon.bin
+    cp -f "${NEXMON_ROOT}"/patches/bcm43430a1/7_45_41_46/nexmon/brcmfmac43430-sdio.bin "${WLAN_FIRMWARE_DIR}"/brcmfmac43430-sdio.bin
+  fi
+  
+  if [ "$RPI_MODEL" = 3P ] ; then
+    cd "${NEXMON_ROOT}"/patches/bcm43455c0/7_45_154/nexmon || exit
+	sed -i -e 's/all:.*/all: $(RAM_FILE)/g' ${NEXMON_ROOT}/patches/bcm43455c0/7_45_154/nexmon/Makefile
+    make clean
+	
+	# We do this so we don't have to install the ancient isl version into /usr/local/lib on systems.
+    LD_LIBRARY_PATH=${NEXMON_ROOT}/buildtools/isl-0.10/.libs make ARCH="${KERNEL_ARCH}" CC="${NEXMON_ROOT}"/buildtools/gcc-arm-none-eabi-5_4-2016q2-linux-x86/bin/arm-none-eabi-
+
+    # RPi3B+ firmware
+	mv "${WLAN_FIRMWARE_DIR}"/brcmfmac43455-sdio.bin "${WLAN_FIRMWARE_DIR}"/brcmfmac43455-sdio.org.bin
+    cp "${NEXMON_ROOT}"/patches/bcm43455c0/7_45_154/nexmon/brcmfmac43455-sdio.bin "${WLAN_FIRMWARE_DIR}"/brcmfmac43455-sdio.nexmon.bin
+    cp -f "${NEXMON_ROOT}"/patches/bcm43455c0/7_45_154/nexmon/brcmfmac43455-sdio.bin "${WLAN_FIRMWARE_DIR}"/brcmfmac43455-sdio.bin
+  fi
+  
+#Revert to previous directory
+cd "${WORKDIR}" || exit
+
+# Remove nexmon sources
+rm -fr "${NEXMON_ROOT}"
+
+fi
diff --git a/files/apt/sources.list b/files/apt/sources.list
index ffc2c9b..07e52dc 100644
--- a/files/apt/sources.list
+++ b/files/apt/sources.list
@@ -1,8 +1,8 @@
-deb http://ftp.debian.org/debian jessie main contrib
-#deb-src http://ftp.debian.org/debian jessie main contrib
+deb http://ftp.debian.org/debian stretch main contrib
+#deb-src http://ftp.debian.org/debian stretch main contrib
 
-deb http://ftp.debian.org/debian/ jessie-updates main contrib
-#deb-src http://ftp.debian.org/debian/ jessie-updates main contrib
+deb http://ftp.debian.org/debian/ stretch-updates main contrib
+#deb-src http://ftp.debian.org/debian/ stretch-updates main contrib
 
-deb http://security.debian.org/ jessie/updates main contrib
-#deb-src http://security.debian.org/ jessie/updates main contrib
+deb http://security.debian.org/ stretch/updates main contrib
+#deb-src http://security.debian.org/ stretch/updates main contrib
diff --git a/files/firstboot/22-expandroot.sh b/files/firstboot/22-expandroot.sh
index 235c411..c2590a2 100644
--- a/files/firstboot/22-expandroot.sh
+++ b/files/firstboot/22-expandroot.sh
@@ -66,3 +66,11 @@ EOF2
 partprobe &&
   resize2fs /dev/${ROOT_PART} &&
   logger -t "rc.firstboot" "Root partition successfully resized."
+
+# Restart dphys-swapfile service if it exists
+if systemctl list-units | grep -q dphys-swapfile ; then
+  if systemctl is-enabled dphys-swapfile ; then
+    logger -t "rc.firstboot" "Restarting dphys-swapfile"
+    systemctl restart dphys-swapfile
+  fi
+fi
diff --git a/files/firstboot/23-regenerate-initramfs.sh b/files/firstboot/23-regenerate-initramfs.sh
index 78e2922..1c4f03c 100644
--- a/files/firstboot/23-regenerate-initramfs.sh
+++ b/files/firstboot/23-regenerate-initramfs.sh
@@ -8,6 +8,7 @@ INITRAMFS_UBOOT="${INITRAMFS}.uboot"
 # Extract kernel arch
 case "${KERNEL_ARCH}" in
   arm*) KERNEL_ARCH=arm ;;
+  aarch64) KERNEL_ARCH=arm64 ;;
 esac
 
 # Regenerate initramfs
diff --git a/files/initramfs/crypt_unlock.sh b/files/initramfs/crypt_unlock.sh
new file mode 100644
index 0000000..47b6a8b
--- /dev/null
+++ b/files/initramfs/crypt_unlock.sh
@@ -0,0 +1,45 @@
+#!/bin/sh
+
+PREREQ="dropbear"
+
+prereqs() {
+echo "$PREREQ"
+}
+
+case "$1" in
+prereqs)
+prereqs
+exit 0
+;;
+esac
+
+. "${CONFDIR}/initramfs.conf"
+. /usr/share/initramfs-tools/hook-functions
+
+if [ "${DROPBEAR}" != "n" ] && [ -r "/etc/crypttab" ] ; then
+cat > "${DESTDIR}/bin/unlock" << EOF
+#!/bin/sh
+if PATH=/lib/unlock:/bin:/sbin /scripts/local-top/cryptroot; then
+kill \`ps | grep cryptroot | grep -v "grep" | awk '{print \$1}'\`
+# following line kill the remote shell right after the passphrase has
+# been entered.
+kill -9 \`ps | grep "\-sh" | grep -v "grep" | awk '{print \$1}'\`
+exit 0
+fi
+exit 1
+EOF
+
+chmod 755 "${DESTDIR}/bin/unlock"
+
+mkdir -p "${DESTDIR}/lib/unlock"
+cat > "${DESTDIR}/lib/unlock/plymouth" << EOF
+#!/bin/sh
+[ "\$1" == "--ping" ] && exit 1
+/bin/plymouth "\$@"
+EOF
+
+chmod 755 "${DESTDIR}/lib/unlock/plymouth"
+
+echo To unlock root-partition run "unlock" >> ${DESTDIR}/etc/motd
+
+fi
\ No newline at end of file
diff --git a/functions.sh b/functions.sh
index 74ca846..4733375 100644
--- a/functions.sh
+++ b/functions.sh
@@ -3,6 +3,17 @@
 cleanup (){
   set +x
   set +e
+  
+  # Remove exports from nexmon
+  unset KERNEL
+  unset ARCH
+  unset SUBARCH
+  unset CCPLUGIN
+  unset ZLIBFLATE
+  unset Q
+  unset NEXMON_SETUP_ENV
+  unset HOSTUNAME
+  unset PLATFORMUNAME
 
   # Identify and kill all processes still using files
   echo "killing processes using mount point ..."
@@ -63,15 +74,43 @@ chroot_install_cc() {
   # Install c/c++ build environment inside the chroot
   if [ -z "${COMPILER_PACKAGES}" ] ; then
     COMPILER_PACKAGES=$(chroot_exec apt-get -s install g++ make bc | grep "^Inst " | awk -v ORS=" " '{ print $2 }')
-	# Install COMPILER_PACKAGES in chroot
-    chroot_exec apt-get -q -y --allow-unauthenticated --no-install-recommends install "${COMPILER_PACKAGES}"
+	# Install COMPILER_PACKAGES in chroot - NEVER do "${COMPILER_PACKAGES}" -> breaks uboot
+    chroot_exec apt-get -q -y --allow-unauthenticated --no-install-recommends install ${COMPILER_PACKAGES}
   fi
 }
 
 chroot_remove_cc() {
   # Remove c/c++ build environment from the chroot
   if [ -n "${COMPILER_PACKAGES}" ] ; then
-    chroot_exec apt-get -qq -y --auto-remove purge "${COMPILER_PACKAGES}"
+    chroot_exec apt-get -qq -y --auto-remove purge ${COMPILER_PACKAGES}
     COMPILER_PACKAGES=""
   fi
 }
+
+# https://serverfault.com/a/682849 - converts e.g. /24 to 255.255.255.0
+cdr2mask ()
+{
+   # Number of args to shift, 255..255, first non-255 byte, zeroes
+   set -- $(( 5 - ($1 / 8) )) 255 255 255 255 $(( (255 << (8 - ($1 % 8))) & 255 )) 0 0 0
+   [ $1 -gt 1 ] && shift $1 || shift
+   echo ${1-0}.${2-0}.${3-0}.${4-0}
+}
+
+# GPL v2.0 - #https://github.com/sakaki-/bcmrpi3-kernel-bis/blob/master/conform_config.sh
+set_kernel_config() {
+  # flag as $1, value to set as $2, config must exist at "./.config"
+  TGT="CONFIG_${1#CONFIG_}"
+  REP="${2}"
+  if grep -q "^${TGT}[^_]" .config; then
+    sed -i "s/^\(${TGT}=.*\|# ${TGT} is not set\)/${TGT}=${REP}/" .config
+  else
+    echo "${TGT}"="${2}" >> .config
+  fi
+}
+
+# unset kernel config parameter
+unset_kernel_config() {
+  # unsets flag with the value of $1, config must exist at "./.config"
+  TGT="CONFIG_${1#CONFIG_}"
+  sed -i "s/^${TGT}=.*/# ${TGT} is not set/" .config
+}
\ No newline at end of file
diff --git a/rpi23-gen-image.sh b/rpi23-gen-image.sh
index 575252a..f328772 100755
--- a/rpi23-gen-image.sh
+++ b/rpi23-gen-image.sh
@@ -57,6 +57,20 @@ FBTURBO_URL=${FBTURBO_URL:=https://github.com/ssvb/xf86-video-fbturbo.git}
 UBOOT_URL=${UBOOT_URL:=https://git.denx.de/u-boot.git}
 VIDEOCORE_URL=${VIDEOCORE_URL:=https://github.com/raspberrypi/userland}
 BLUETOOTH_URL=${BLUETOOTH_URL:=https://github.com/RPi-Distro/pi-bluetooth.git}
+NEXMON_URL=${NEXMON_URL:=https://github.com/seemoo-lab/nexmon.git}
+SYSTEMDSWAP_URL=${SYSTEMDSWAP_URL:=https://github.com/Nefelim4ag/systemd-swap.git}
+
+# Kernel deb packages for 32bit kernel
+RPI_32_KERNEL_URL=${RPI_32_KERNEL_URL:=https://github.com/hypriot/rpi-kernel/releases/download/v4.14.34/raspberrypi-kernel_20180422-141901_armhf.deb}
+RPI_32_KERNELHEADER_URL=${RPI_32_KERNELHEADER_URL:=https://github.com/hypriot/rpi-kernel/releases/download/v4.14.34/raspberrypi-kernel-headers_20180422-141901_armhf.deb}
+# Kernel has KVM and zswap enabled - use if KERNEL_* parameters and precompiled kernel are used 
+RPI3_64_BIS_KERNEL_URL=${RPI3_64_BIS_KERNEL_URL:=https://github.com/sakaki-/bcmrpi3-kernel-bis/releases/download/4.14.80.20181113/bcmrpi3-kernel-bis-4.14.80.20181113.tar.xz}
+# Default precompiled 64bit kernel
+RPI3_64_DEF_KERNEL_URL=${RPI3_64_DEF_KERNEL_URL:=https://github.com/sakaki-/bcmrpi3-kernel/releases/download/4.14.80.20181113/bcmrpi3-kernel-4.14.80.20181113.tar.xz}
+# Generic 
+RPI3_64_KERNEL_URL=${RPI3_64_KERNEL_URL:=$RPI3_64_DEF_KERNEL_URL}
+# Kali kernel src - used if ENABLE_NEXMON=true (they patch the wlan kernel modul)
+KALI_KERNEL_URL=${KALI_KERNEL_URL:=https://github.com/Re4son/re4son-raspberrypi-linux.git}
 
 # Build directories
 WORKDIR=$(pwd)
@@ -105,6 +119,7 @@ NET_NTP_2=${NET_NTP_2:=""}
 # APT settings
 APT_PROXY=${APT_PROXY:=""}
 APT_SERVER=${APT_SERVER:="ftp.debian.org"}
+KEEP_APT_PROXY=${KEEP_APT_PROXY:=false}
 
 # Feature settings
 ENABLE_PRINTK=${ENABLE_PRINTK:=false}
@@ -138,19 +153,26 @@ SSH_ROOT_PUB_KEY=${SSH_ROOT_PUB_KEY:=""}
 SSH_USER_PUB_KEY=${SSH_USER_PUB_KEY:=""}
 
 # Advanced settings
+ENABLE_SYSTEMDSWAP=${ENABLE_SYSTEMDSWAP:=false}
 ENABLE_MINBASE=${ENABLE_MINBASE:=false}
 ENABLE_REDUCE=${ENABLE_REDUCE:=false}
 ENABLE_UBOOT=${ENABLE_UBOOT:=false}
 UBOOTSRC_DIR=${UBOOTSRC_DIR:=""}
+ENABLE_UBOOTUSB=${ENABLE_UBOOTUSB=false}
 ENABLE_FBTURBO=${ENABLE_FBTURBO:=false}
 ENABLE_VIDEOCORE=${ENABLE_VIDEOCORE:=false}
+ENABLE_NEXMON=${ENABLE_NEXMON:=false}
 VIDEOCORESRC_DIR=${VIDEOCORESRC_DIR:=""}
 FBTURBOSRC_DIR=${FBTURBOSRC_DIR:=""}
+NEXMONSRC_DIR=${NEXMONSRC_DIR:=""}
 ENABLE_HARDNET=${ENABLE_HARDNET:=false}
 ENABLE_IPTABLES=${ENABLE_IPTABLES:=false}
 ENABLE_SPLITFS=${ENABLE_SPLITFS:=false}
 ENABLE_INITRAMFS=${ENABLE_INITRAMFS:=false}
 ENABLE_IFNAMES=${ENABLE_IFNAMES:=true}
+ENABLE_SPLASH=${ENABLE_SPLASH:=true}
+ENABLE_LOGO=${ENABLE_LOGO:=true}
+ENABLE_SILENT_BOOT=${ENABLE_SILENT_BOOT=false}
 DISABLE_UNDERVOLT_WARNINGS=${DISABLE_UNDERVOLT_WARNINGS:=}
 
 # Kernel compilation settings
@@ -162,6 +184,12 @@ KERNEL_MENUCONFIG=${KERNEL_MENUCONFIG:=false}
 KERNEL_REMOVESRC=${KERNEL_REMOVESRC:=true}
 KERNEL_OLDDEFCONFIG=${KERNEL_OLDDEFCONFIG:=false}
 KERNEL_CCACHE=${KERNEL_CCACHE:=false}
+KERNEL_ZSWAP=${KERNEL_ZSWAP:=false}
+KERNEL_VIRT=${KERNEL_VIRT:=false}
+KERNEL_BPF=${KERNEL_BPF:=false}
+KERNEL_DEFAULT_GOV=${KERNEL_DEFAULT_GOV:=powersave}
+KERNEL_SECURITY=${KERNEL_SECURITY:=false}
+KERNEL_NF=${KERNEL_NF:=false}
 
 # Kernel compilation from source directory settings
 KERNELSRC_DIR=${KERNELSRC_DIR:=""}
@@ -185,6 +213,10 @@ CRYPTFS_PASSWORD=${CRYPTFS_PASSWORD:=""}
 CRYPTFS_MAPPING=${CRYPTFS_MAPPING:="secure"}
 CRYPTFS_CIPHER=${CRYPTFS_CIPHER:="aes-xts-plain64:sha512"}
 CRYPTFS_XTSKEYSIZE=${CRYPTFS_XTSKEYSIZE:=512}
+#Dropbear-initramfs supports unlocking encrypted filesystem via SSH on bootup
+CRYPTFS_DROPBEAR=${CRYPTFS_DROPBEAR:=false}
+#Provide your own Dropbear Public RSA-OpenSSH Key otherwise it will be generated
+CRYPTFS_DROPBEAR_PUBKEY=${CRYPTFS_DROPBEAR_PUBKEY:=""}
 
 # Chroot scripts directory
 CHROOT_SCRIPTS=${CHROOT_SCRIPTS:=""}
@@ -203,11 +235,9 @@ MISSING_PACKAGES=""
 # Packages installed for c/c++ build environment in chroot (keep empty)
 COMPILER_PACKAGES=""
 
-set +x
-
-#Check if apt-cacher-ng has port 3142 open and set APT_PROXY
-APT_CACHER_RUNNING=$(lsof -i :3142 | grep apt-cacher-ng |  cut -d ' ' -f3 | uniq)
-if [ -n "${APT_CACHER_RUNNING}" ] ; then
+# Check if apt-cacher-ng has port 3142 open and set APT_PROXY
+APT_CACHER_RUNNING=$(lsof -i :3142 | cut -d ' ' -f3 | uniq | sed '/^\s*$/d')
+if [ "${APT_CACHER_RUNNING}" = "apt-cacher-ng" ] ; then
   APT_PROXY=http://127.0.0.1:3142/
 fi
 
@@ -258,7 +288,7 @@ if [ -n "$SET_ARCH" ] ; then
       CROSS_COMPILE=${CROSS_COMPILE:=arm-linux-gnueabihf-}
     fi
   fi
-#SET_ARCH not set
+# SET_ARCH not set
 else
   echo "error: Please set '32' or '64' as value for SET_ARCH"
   exit 1
@@ -295,12 +325,26 @@ case "$RPI_MODEL" in
     ;;
 esac
 
+if [ "$ENABLE_UBOOTUSB" = true ] ; then
+  if [ "$ENABLE_UBOOT" = false ] ; then
+    echo "error: Enabling UBOOTUSB requires u-boot to be enabled"
+	exit 1
+  fi
+  if [ "$RPI_MODEL" != 3 ] || [ "$RPI_MODEL" != 3P ] ; then
+    echo "error: Enabling UBOOTUSB requires Raspberry 3"
+	exit 1
+  fi
+fi
+
 # Raspberry PI 0,3,3P with Bluetooth and Wifi onboard
 if [ "$RPI_MODEL" = 0 ] || [ "$RPI_MODEL" = 3 ] || [ "$RPI_MODEL" = 3P ] ; then
   # Include bluetooth packages on supported boards
-  if [ "$ENABLE_BLUETOOTH" = true ] && [ "$ENABLE_CONSOLE" = false ]; then
+  if [ "$ENABLE_BLUETOOTH" = true ] ; then
     APT_INCLUDES="${APT_INCLUDES},bluetooth,bluez"
   fi
+  if [ "$ENABLE_WIRELESS" = true ] ; then
+    APT_INCLUDES="${APT_INCLUDES},wireless-tools,crda,wireless-regdb"
+  fi
 else # Raspberry PI 1,1P,2 without Wifi and bluetooth onboard
   # Check if the internal wireless interface is not supported by the RPi model
   if [ "$ENABLE_WIRELESS" = true ] || [ "$ENABLE_BLUETOOTH" = true ]; then
@@ -309,6 +353,11 @@ else # Raspberry PI 1,1P,2 without Wifi and bluetooth onboard
   fi
 fi
 
+if [ "$BUILD_KERNEL" = false ] && [ "$ENABLE_NEXMON" = true ]; then
+  echo "error: You have to compile kernel sources, if you want to enable nexmon"
+  exit 1
+fi
+
 # Prepare date string for default image file name
 DATE="$(date +%Y-%m-%d)"
 if [ -z "$KERNEL_BRANCH" ] ; then
@@ -330,6 +379,11 @@ if [ "$ENABLE_VIDEOCORE" = true ] ; then
   REQUIRED_PACKAGES="${REQUIRED_PACKAGES} cmake"
 fi
 
+# Add deps for nexmon
+if [ "$ENABLE_NEXMON" = true ] ; then
+  REQUIRED_PACKAGES="${REQUIRED_PACKAGES} libgmp3-dev gawk qpdf bison flex make autoconf automake build-essential libtool"
+fi
+
 # Add libncurses5 to enable kernel menuconfig
 if [ "$KERNEL_MENUCONFIG" = true ] ; then
   REQUIRED_PACKAGES="${REQUIRED_PACKAGES} libncurses-dev"
@@ -345,6 +399,11 @@ if [ "$ENABLE_CRYPTFS" = true ]  && [ "$BUILD_KERNEL" = true ] ; then
   REQUIRED_PACKAGES="${REQUIRED_PACKAGES} cryptsetup"
   APT_INCLUDES="${APT_INCLUDES},cryptsetup,busybox,console-setup"
 
+  # If cryptfs,dropbear and initramfs are enabled include dropbear-initramfs package
+  if [ "$CRYPTFS_DROPBEAR" = true ] && [ "$ENABLE_INITRAMFS" = true ]; then
+    APT_INCLUDES="${APT_INCLUDES},dropbear-initramfs"
+  fi
+  
   if [ -z "$CRYPTFS_PASSWORD" ] ; then
     echo "error: no password defined (CRYPTFS_PASSWORD)!"
     exit 1
@@ -362,14 +421,6 @@ if [ "$ENABLE_UBOOT" = true ] ; then
   APT_INCLUDES="${APT_INCLUDES},device-tree-compiler,bison,flex,bc"
 fi
 
-if [ "$ENABLE_BLUETOOTH" = true ] ; then
-  if [ "$RPI_MODEL" = 0 ] || [ "$RPI_MODEL" = 3 ] || [ "$RPI_MODEL" = 3P ] ; then
-    if [ "$ENABLE_CONSOLE" = false ] ; then
-	  APT_INCLUDES="${APT_INCLUDES},bluetooth,bluez"
-	fi
-  fi
-fi
-
 # Check if root SSH (v2) public key file exists
 if [ -n "$SSH_ROOT_PUB_KEY" ] ; then
   if [ ! -f "$SSH_ROOT_PUB_KEY" ] ; then
@@ -386,6 +437,11 @@ if [ -n "$SSH_USER_PUB_KEY" ] ; then
   fi
 fi
 
+if [ "$ENABLE_NEXMON" = true ] && [ -n "$KERNEL_BRANCH" ] ; then
+  echo "error: Please unset KERNEL_BRANCH if using ENABLE_NEXMON"
+  exit 1
+fi
+
 # Check if all required packages are installed on the build system
 for package in $REQUIRED_PACKAGES ; do
   if [ "$(dpkg-query -W -f='${Status}' "$package")" != "install ok installed" ] ; then
@@ -442,6 +498,12 @@ if [ -n "$FBTURBOSRC_DIR" ] && [ ! -d "$FBTURBOSRC_DIR" ] ; then
   exit 1
 fi
 
+# Check if specified NEXMONSRC_DIR directory exists
+if [ -n "$NEXMONSRC_DIR" ] && [ ! -d "$NEXMONSRC_DIR" ] ; then
+  echo "error: '${NEXMONSRC_DIR}' specified directory not found (NEXMONSRC_DIR)!"
+  exit 1
+fi
+
 # Check if specified CHROOT_SCRIPTS directory exists
 if [ -n "$CHROOT_SCRIPTS" ] && [ ! -d "$CHROOT_SCRIPTS" ] ; then
    echo "error: ${CHROOT_SCRIPTS} specified directory not found (CHROOT_SCRIPTS)!"
@@ -493,6 +555,10 @@ fi
 if [ "$ENABLE_IPTABLES" = true ] ; then
   APT_INCLUDES="${APT_INCLUDES},iptables,iptables-persistent"
 fi
+# Add apparmor for KERNEL_SECURITY
+if [ "$KERNEL_SECURITY" = true ] ; then
+  APT_INCLUDES="${APT_INCLUDES},apparmor,apparmor-utils,apparmor-profiles,apparmor-profiles-extra,libapparmor-perl"
+fi
 
 # Add openssh server package
 if [ "$ENABLE_SSHD" = true ] ; then
@@ -546,16 +612,6 @@ if [ "$ENABLE_SYSVINIT" = false ] ; then
   APT_EXCLUDES="--exclude=${APT_EXCLUDES},init,systemd-sysv"
 fi
 
-# Check if kernel is getting compiled
-if [ "$BUILD_KERNEL" = false ] ; then
-  echo "Downloading precompiled kernel"
-  echo "error: not configured"
-  exit 1;
-# BUILD_KERNEL=true
-else
-  echo "No precompiled kernel repositories were added"
-fi
-
 # Configure kernel sources if no KERNELSRC_DIR
 if [ "$BUILD_KERNEL" = true ] && [ -z "$KERNELSRC_DIR" ] ; then
   KERNELSRC_CONFIG=true
@@ -623,13 +679,17 @@ umount -l "${R}/sys"
 rm -rf "${R}/run/*"
 rm -rf "${R}/tmp/*"
 
+# Clean up APT proxy settings
+if [ "$KEEP_APT_PROXY" = false ] ; then
+  rm -f "${ETC_DIR}/apt/apt.conf.d/10proxy"
+fi
+
 # Clean up files
 rm -f "${ETC_DIR}/ssh/ssh_host_*"
 rm -f "${ETC_DIR}/dropbear/dropbear_*"
 rm -f "${ETC_DIR}/apt/sources.list.save"
 rm -f "${ETC_DIR}/resolvconf/resolv.conf.d/original"
 rm -f "${ETC_DIR}/*-"
-rm -f "${ETC_DIR}/apt/apt.conf.d/10proxy"
 rm -f "${ETC_DIR}/resolv.conf"
 rm -f "${R}/root/.bash_history"
 rm -f "${R}/var/lib/urandom/random-seed"