Exclamation [Q] REVERTING from f2fs TO EXT4

how REVERTING from f2fs TO EXT4 ??????????

this way not success
REVERTING TO EXT4 and Normal :---

1. Reboot into the recovery
2. flash the restore partition
3. go to mounts
4. format data.
5. install your desired ROM..
6. You are back to normal...