Reportedly they changed the requirement for bootloader unlocking to be much harder, with a global limited number activation per day. Basically next to impossible with the official tools.

It won’t be long before Custom Rom maintainer will lose interest on new Xiaomi phones.

https://github.com/zenfyrdev/bootloader-unlock-wall-of-shame/blob/main/brands/xiaomi/README.md

https://sheldonbrown.com/

About bicycle maintenance.