让 LineageOS、Piexl Experience 刷机清除 /data 后继续保持开启 Camera2 API 以便使用谷歌相机，可以将这个文件放入 /system/addon.d/99-enable-camera2-api.sh

99-enable-camera2-api.sh

#!/sbin/sh
#
# ADDOND_VERSION=2
#
# /system/addon.d/99-enable-camera2-api.sh
# During a upgrade, this script enable Camera2 API on /system/build.prop
# 
# 执行命令 adb shell su -c setprop persist.camera.HAL3.enabled 1 后
# 虽然 getprop 能获得 1 但是谷歌相机无法启动，所以还是需要之前的脚本。
# 或者 adb shell su 后执行
#   mount -o rw,remount /system ; echo persist.camera.HAL3.enabled=1 >> /system/build.prop ; mount -o ro,remount /system
# 

. /tmp/backuptool.functions

case "$1" in
  backup)
    # Stub
  ;;
  restore)
    grep -q persist.camera.HAL3.enabled=1 /system/build.prop || echo persist.camera.HAL3.enabled=1 >> /system/build.prop
  ;;
  pre-backup)
    # Stub
  ;;
  post-backup)
    # Stub
  ;;
  pre-restore)
    # Stub
  ;;
  post-restore)
    # Stub
  ;;