Anyhow, to unlock the device the official way I have to identify to their services through a phone line, not internet, and purchase a sim card, which I'm not going to do to experiment with this device.
I have no use for the stock software in the device and I'd rather have anything foss that works or kinda works.
If you ever experimented with this particular model or know what could work, feel free to post an answer.
Older Redmis allow bootloader unlocking from Developer Options. Then some seller installed malware this way so newer models require you to register as a user.