Device name：Redmi K40 / Mi 11X / POCO F3

Codename：alioth

Bootloader：You need to unlock the bootloader if you want to flash a rom into your phone via fastboot method, and your data could be deleted as you choose, please make sure you have backed up your personal data. , Apply for Bootloader Unlock here.

MIUI Roms：Yes , go to the MIUI site: Redmi K40 / Mi 11X / POCO F3(alioth) - MIUI Official ROMs