This is an iteration of the Mi 9 MIUI 12 ROMs. The first MIUI 12 firmware or update for Mi 9 has already been released on 2020-04-27 by Xiaomi. You can now download the stable, weekly, or beta MIUI 12 ROM for your phone/tablet with device code cepheus. The last version of Mi 9 MIUI 12 ROM has been rolled out on 2021-04-25. It is recommended to update to the latest MIUI12 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.