This is an iteration of the Mi 9 MIUI 12.5 ROMs. The first MIUI 12.5 firmware or update for Mi 9 has already been released on 2020-12-28 by Xiaomi. You can now download the stable, weekly, or beta MIUI 12.5 ROM for your phone/tablet with device code cepheus. The last version of Mi 9 MIUI 12.5 ROM has been rolled out on 2021-12-01. It is recommended to update to the latest MIUI12.5 to experience the new features. If you want to upgrade or downgrade your MIUI version, you can find more details on the Mi 9 ROM section page.