diff --git a/build.py b/build.py
index 4b45311c5..826c804dd 100755
--- a/build.py
+++ b/build.py
@@ -238,6 +238,9 @@ def zip_main(args):
 				source = os.path.join('libs', lib_dir, binary)
 				target = os.path.join(zip_dir, binary)
 				zip_with_msg(zipf, source, target)
+		source = os.path.join('libs', 'arm64-v8a', 'magiskinit')
+		target = os.path.join('arm64', 'magiskinit')
+		zip_with_msg(zipf, source, target)
 
 		# APK
 		source = os.path.join('MagiskManager', 'app', 'build', 'outputs', 'apk',
diff --git a/scripts/boot_patch.sh b/scripts/boot_patch.sh
index ce313bc28..f2c78e9d1 100644
--- a/scripts/boot_patch.sh
+++ b/scripts/boot_patch.sh
@@ -200,23 +200,54 @@ esac
 
 ui_print_wrap "- Patching ramdisk"
 
-# Add magisk entrypoint
-./magiskboot --cpio-patch ramdisk.cpio $KEEPVERITY $KEEPFORCEENCRYPT
-
-# sepolicy patches
-cpio_extract sepolicy sepolicy
-./magisk magiskpolicy --load sepolicy --save sepolicy --minimal
-cpio_add 644 sepolicy sepolicy
-rm -f sepolicy
-
-# Add new items
 if [ ! -z $SHA1 ]; then
   cp init.magisk.rc init.magisk.rc.bak
   echo "# STOCKSHA1=$SHA1" >> init.magisk.rc
 fi
-cpio_add 750 init.magisk.rc init.magisk.rc
+
+if $SKIP_INITRAMFS; then
+  # First check precompiled ones
+  [ -f /system_root/sepolicy ] && cp /system_root/sepolicy sepolicy
+  if [ ! -f sepolicy -a -f /vendor/etc/selinux/precompiled_sepolicy ]; then
+    # Check SHA256
+    SYSTEMSHA256=`find /system/etc/selinux -name '*.sha256' -exec cat {} \; 2>/dev/null`
+    VENDORSHA256=`find /vendor/etc/selinux -name '*.sha256' -exec cat {} \; 2>/dev/null`
+    [ "$SYSTEMSHA256" = "$VENDORSHA256" ] && cp /vendor/etc/selinux/precompiled_sepolicy sepolicy
+  fi
+  if [ ! -f sepolicy ]; then
+    ui_print_wrap "- Compiling split cil policies"
+    # Compile the split policies
+    POLICY_VER=`cat /sys/fs/selinux/policyvers`
+    PLAT_CIL=/system/etc/selinux/plat_sepolicy.cil
+    NONPLAT_CIL=`find /vendor/etc/selinux -name '*.cil' 2>/dev/null`
+    VENDOR_PLAT_VER=`cat /vendor/etc/selinux/plat_sepolicy_vers.txt`
+    MAPPING_CIL=/system/etc/selinux/mapping/${VENDOR_PLAT_VER}.cil
+    ./magisk magisksecilc -M true -c $POLICY_VER -o sepolicy -f /dev/null $PLAT_CIL $NONPLAT_CIL $MAPPING_CIL
+  fi
+  [ -f sepolicy ] || abort_wrap "! Cannot get sepolicy"
+
+  # TODO: Patch dm-verity
+
+  cpio_add 750 init ./magiskinit
+  cpio_mkdir 000 overlay
+  cpio_add 750 overlay/init.magisk.rc init.magisk.rc
+  cpio_mkdir 750 overlay/sbin
+  cpio_add 755 overlay/sbin/magisk magisk
+else
+  ./magiskboot --cpio-patch ramdisk.cpio $KEEPVERITY $KEEPFORCEENCRYPT
+
+  cpio_extract sepolicy sepolicy
+
+  cpio_add 750 init.magisk.rc init.magisk.rc
+  cpio_add 755 sbin/magisk magisk
+fi
+
 mv init.magisk.rc.bak init.magisk.rc 2>/dev/null
-cpio_add 755 sbin/magisk magisk
+
+# sepolicy patches
+./magisk magiskpolicy --load sepolicy --save sepolicy --minimal
+$SKIP_INITRAMFS && cpio_add 644 overlay/sepolicy sepolicy || cpio_add 644 sepolicy sepolicy
+rm -f sepolicy
 
 # Create ramdisk backups
 ./magiskboot --cpio-backup ramdisk.cpio ramdisk.cpio.orig
@@ -234,6 +265,11 @@ rm -f ramdisk.cpio.orig
 49010054011440B93FA00F71E9000054010840B93FA00F7189000054001840B91FA00F7188010054 \
 A1020054011440B93FA00F7140020054010840B93FA00F71E0010054001840B91FA00F7181010054
 
+# skip_initramfs -> want_initramfs
+./magiskboot --hexpatch kernel \
+736B69705F696E697472616D6673 \
+77616E745F696E697472616D6673
+
 ui_print_wrap "- Repacking boot image"
 ./magiskboot --repack "$BOOTIMAGE" || abort_wrap "! Unable to repack boot image!"
 
diff --git a/scripts/flash_script.sh b/scripts/flash_script.sh
index 94fc0b764..60ad9926b 100644
--- a/scripts/flash_script.sh
+++ b/scripts/flash_script.sh
@@ -49,13 +49,8 @@ ui_print "************************"
 ui_print "* Magisk v$MAGISK_VER Installer"
 ui_print "************************"
 
-ui_print "- Mounting /system, /vendor, /cache, /data"
-mount -o ro /system 2>/dev/null
-mount -o ro /vendor 2>/dev/null
-mount /cache 2>/dev/null
-mount /data 2>/dev/null
-
-[ -f /system/build.prop ] || abort "! /system could not be mounted!"
+is_mounted /data || mount /data
+mount_partitions
 
 # read override variables
 getvar KEEPVERITY
diff --git a/scripts/util_functions.sh b/scripts/util_functions.sh
index 0528f0bdc..8e0a88408 100644
--- a/scripts/util_functions.sh
+++ b/scripts/util_functions.sh
@@ -37,6 +37,36 @@ ui_print() {
   fi
 }
 
+mount_partitions() {
+  # Check A/B slot
+  SLOT=`getprop ro.boot.slot_suffix`
+  [ -z $SLOT ] || ui_print "- A/B partition detected, current slot: $SLOT"
+  ui_print "- Mounting /system, /vendor"
+  is_mounted /system || [ -f /system/build.prop ] || mount -o ro /system 2>/dev/null
+  if ! is_mounted /system && ! [ -f /system/build.prop ]; then
+    SYSTEMBLOCK=`find /dev/block -iname system$SLOT | head -n 1`
+    mount -t ext4 -o ro $SYSTEMBLOCK /system
+  fi
+  is_mounted /system || [ -f /system/build.prop ] || abort "! Cannot mount /system"
+  cat /proc/mounts | grep /dev/root >/dev/null && SKIP_INITRAMFS=true || SKIP_INITRAMFS=false
+  if [ -f /system/init.rc ]; then
+    SKIP_INITRAMFS=true
+    mkdir /system_root 2>/dev/null
+    mount --move /system /system_root
+    mount -o bind /system_root/system /system
+  fi
+  $SKIP_INITRAMFS && ui_print "- Device skip_initramfs detected"
+  if [ -L /system/vendor ]; then
+    # Seperate /vendor partition
+    is_mounted /vendor || mount -o ro /vendor 2>/dev/null
+    if ! is_mounted /vendor; then
+      VENDORBLOCK=`find /dev/block -iname vendor$SLOT | head -n 1`
+      mount -t ext4 -o ro $VENDORBLOCK /vendor
+    fi
+    is_mounted /vendor || abort "! Cannot mount /vendor"
+  fi
+}
+
 grep_prop() {
   REGEX="s/^$1=//p"
   shift
@@ -58,10 +88,14 @@ getvar() {
 
 find_boot_image() {
   if [ -z "$BOOTIMAGE" ]; then
-    for BLOCK in boot_a kern-a android_boot kernel boot lnx; do
-      BOOTIMAGE=`find /dev/block -iname $BLOCK | head -n 1` 2>/dev/null
-      [ ! -z $BOOTIMAGE ] && break
-    done
+    if [ ! -z $SLOT ]; then
+      BOOTIMAGE=`find /dev/block -iname boot$SLOT | head -n 1` 2>/dev/null
+    else
+      for BLOCK in boot_a kern-a android_boot kernel boot lnx; do
+        BOOTIMAGE=`find /dev/block -iname $BLOCK | head -n 1` 2>/dev/null
+        [ ! -z $BOOTIMAGE ] && break
+      done
+    fi
   fi
   # Recovery fallback
   if [ -z "$BOOTIMAGE" ]; then
@@ -180,6 +214,7 @@ recovery_cleanup() {
   export LD_LIBRARY_PATH=$OLD_LD_PATH
   [ -z $OLD_PATH ] || export PATH=$OLD_PATH
   ui_print "- Unmounting partitions"
+  umount -l /system_root 2>/dev/null
   umount -l /system 2>/dev/null
   umount -l /vendor 2>/dev/null
   umount -l /dev/random 2>/dev/null