This script will chain load an Android recovery from the FOTAKernel partition.

• Put bootrec folder in the root of your ramdisk.
• If not on ARM64, replace busybox and extract_elf_ramdisk binaries.
• Move your /init to /init.real
• Symlink /init to /bootrec/init.sh
• ???
• Profit.

The init.sh script is setup for Xperia Z5/Z5C. On other devices you might have to change some paths at the top of the script file.