When I first installed the rom (21.5.20)
I unlocked my MI 11 by the offical unlock tool.
I downloaded the TWRP from https://androidfilehost.com/?w=files&flid=321497
I changed the name of the TWRP img to 'twrp-recovery-venus.img'
Then I did the command 'fastboot boot twrp-recovery-venus.img' and...