Sony F5121: Forgot Device Encryption Passwort, locked bootloader

Question

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.



enter image description here


— bonanza | Sources

Answer

— bonanza | Sources

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