Device name:Redmi Note 11S 4G / POCO M4 Pro 4G
Codename:fleur
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 Note 11S 4G / POCO M4 Pro 4G(fleur) - MIUI Official ROMs