I switched my Sailfish device from the XA2 Ultra to a 10 mark i and want to sell my XA2. I managed to install Android on it again using Xperifirm and newflasher. Now I want to lock the device again and thought this was possible using:
$ adb reboot bootloader
$ fastboot oem lock
$ fastboot oem lock *devicedeveloperunlockcode*
But both fastboot lock command result in:
FAILED (remote: 'unknown command') fastboot: error: Command failed
If I try to unlock, which it is already, I get a rather normal
FAILED (remote: 'Device already unlocked').
Does anyone have a suggestion to what I’m doing wrong. I have no access to a Windows PC, so EMMA is not an option.