The Stable update V12.1.2.0.RFJINXM has been officially released for Redmi K20 (codename is davinciin). 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: Redmi K20 ROM Topics Xiaomi Devices Index
Download Redmi k20 (davinciin) India (IN) MIUI 12 V12.1.2.0.RFJINXM Recovery ROM with Android 11.0. Firmware size is 2.4 GB.