The Stable update V12.0.7.0.QCRINRF has been officially released for POCO C3/C31 (codename is angelicain). 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 MIUI or HyperOS 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: POCO C3/C31 ROM Topics Xiaomi Devices Index
Download Poco c31 (angelicain) India (IN) MIUI 12 V12.0.7.0.QCRINRF Recovery ROM with Android 10.0. Firmware size is 1.9 GB.