Sony F5121: Forgot Device Encryption Passwort, locked bootloader I forget the device encryption password for my F5121 (locked bootloader). Is there any way to hard-reset the device, so I can use it again (I don't care about the data on it)?

I already tried some combination with Power Button + Volumne Up/Down, but I don't see any options popping up.

Also, unlocking the bootloader does not seem to work (probably I should have enabled oem unlocking in the android settings before), it says:

FAILED (remote: 'Command not allowed')


Same error, when trying to flash TWRP.
I can't believe it. Entering anything (but the password) for 30 times resets the phones.
I also stumbled upon this (later on), it looks like there is default password in AOSP based ROMS: How does Marshmallow encryption work technically?