Note that this page shows the V12.5.6.0.RFACNXM update for Mi 9, cepheus only. If you're looking for other updates for this same codename, please check here.
Xiaomi Mi 9 Android smartphone. Announced Feb 2019. Features 6.39″ display, Snapdragon 855 chipset, 3300 mAh battery, 256 GB storage, 8 GB RAM, Corning Gorilla Glass 6.
V12.5.6.0.RFACNXM MIUI/HyperOS firmware/update can be installed via Fastboot method