Fix error 255 on TWRP backup/restore

[fanaticgamer]

I've just had the same issue

I had to factory reset the phone, wipe internal memoy, let it boot once, don't add any pin or screen lock, or remove the previous one
Then the restore went just ok, I've managed to restore my previous data without receiving the error:

Error during restore process. extractTarFork() process ended with ERROR: 255

 

[lexobys01]

Ok...so I manage to get the data backup/restore working by doing this :

1.check other user in data/system : no other user exist but user 0, not working
2.chek 999 in data/system : no 999 folder/file exist, still not working
3. In terminal by typing ls */10 or /5 etc : coudn't find any file/folder
4. Removing screenlock/password in setting : victory!! Both backing up & restoring data is workimg fine without any 255 error

 

[FedeTrifo06]

I found the solution:
-change the filesystem of data from ext4 to ext2
-change the filesystem of data from ext2 to ext4 again
It worked for me while all the other methods described above didn't.



If I have been of help, leave me a thanks

 

[exadeci]

NVM

 

[73xTer]

Im using the newest blu_spark TWRP with my OP5 OEM unlocked rooted with magisk running the 5.01 OOS.
BACKUP
Before running a backup do the following in TWRP/Advanced/Terminal

(enter exactly into terminal, if 999 'doesn't exist' move on to the next)
cd /data/system/
rm -r 999
cd data/system_ce/
rm -r 999
cd data/system_de/
rm -r 999
cd data/misc/
rm -r 999
cd data/misc_ce/
rm -r 999
cd data/misc_de/
rm -r 999
cd data/user/
rm -r 999
cd data/user_ce/
rm -r 999
cd data/user_de/
rm -r 999

You will successfully be able to backup!!

RESTORE:
@simo6 Gave me the solution. You need to go into the TWRP terminal before doing a restore and delete:

(enter exactly into terminal, if 999 'doesn't exist' move on to the next)
cd /data/system/
rm -r 999
cd data/system_ce/
rm -r 999
cd data/system_de/
rm -r 999
cd data/misc/
rm -r 999
cd data/misc_ce/
rm -r 999
cd data/misc_de/
rm -r 999
cd data/user/
rm -r 999
cd data/user_ce/
rm -r 999
cd data/user_de/
rm -r 999

then restore your backup!

This solve my problem for backup by doing every steps 1 by 1
Note: should also do rm -r 999 in the ff folders
cd data/media/
cd data/vendor/
cd data/vendor_ce/
cd data/vendor_de/