Device name：Mi MIX FOLD

Codename：cetus

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: Mi MIX FOLD(cetus) - MIUI Official ROMs