I don't have recovery data (TT)Have you tried going into stock recovery and doing a factory rest and and resetting cache?
Something you can try
1. Flash a custom recovery, TWRP would be best, via ODIN.
2. Reboot phone, then boot in to the recovery.
3. Do a factory reset, clear cache etc.
4. Reboot to bootloader/download mode.
5. Reflash the Docomo fw.
I can't factory reset.
E:failed to mount /efs (Invalied argument)