Error in Galaxy tab a: 'Unable to restart your device. Verification failed' after supersu I own a Galaxy tab a 10.1 with s pen (2016). I flashed via odin, twrp 3.1.1.0 and the system booted fine. Then I flashed the last version of SuperSU and since then the system doesn't turn on and I get the famous
Verification failed. Unable to restart your device. The integrity verification has failed. You need to restart your device to factory default settings. This will erase your data.

As I can't access my data in twrp, I tried to flash no-verity-opt-encrypt (6.0) but it doesn't help and I still can't access my data on the internal storage from twrp. Before I do a factory reset, I'd like to backup my data. Do you know if it's possible or how can I fix this error?

Will flashing the stock firmware help?
Uhh, ok. If you're able to boot to TWRP, click mount and put a check mark in each box. Go back to TWRP file manager and poooof you shout see what you're looking for. Backup all partitions, then do a factory wipe.  Go to restore and only check "data". I suggest you root with Magisk (system-less) and find yourself a sweet custom ROM like AEX.