I did format the userdata partition while installing a new ROM accidentally. But after formating and installing a new ROM, I did backup full userdata partition within TWRP with dd method for data recovery purpose. I tried testdik, photorec and other data recovery tools. They all found something but not useful/meaningfull because, all directories/filenames are weird, I mean in UTF8 format (although there are some meaningfull files but not I'm interested in :( ). My phone is OnePuls 6T running Android 10 on it and I know FDE and FBE concepts. But while backing up my userdata even it is encrypted, TWRP works well and decrypt partition before work with my password.
So, why some files are in well situaition and others not. If there is encryption issues shouldn't be the same for all files.
Is there any comment? Thanks.