How to use:
- Push UNSPARSED system.img to /sdcard
- Create file /cache/phh/flash
- Create block.map:
$ uncrypt /data/media/0/system.img /cache/phh/block.map
- Reboot
This is done by copying /system to a tmpfs, then killing all services,
moving /system to /dev/old-system, unmounting it, then applying
uncrypt's block.map
Tested devices as of today:
- Blackview A20
- Huawei Mate 9
