The Closed Beta / Nightly update 21.12.7 has been officially released for Xiaomi Civi (codename is mona). Before updating, please make sure you have downloaded the exact ROM matching your Xiaomi phone/tablet. In Fastboot mode, you can check model code by typing
fastboot getvar product in cmd/shell.
The firmware files posted here are all official Xiaomi ROM, xiaomiROM.com do not own and never modified those firmwares，you will always download the file from Xiaomi server.
You may interest in those contents: Xiaomi Civi ROM Topics Xiaomi Devices Index
Download Xiaomi civi (mona) China MIUI 12.5 21.12.7 Recovery ROM with Android 12.0. Firmware size is 4.9 GB.