Xiaomi is now retroactively locking bootloaders: <a href="http:&#x2F;&#x2F;www.xda-developers.com&#x2F;xiaomi-locks-bootloader-on-recent-devices&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.xda-developers.com&#x2F;xiaomi-locks-bootloader-on-rec...</a>