The Stable update V12.0.9.0.RKKCNXM has been officially released for Redmi K40 Pro/Pro+ / Mi 11i / Mi 11X Pro (codename is haydn). 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 K40 Pro/Pro+ / Mi 11i / Mi 11X Pro ROM Topics Xiaomi Devices Index
Download Redmi k40 pro / k40 pro+ (haydn) China MIUI 12 V12.0.9.0.RKKCNXM Recovery ROM with Android 11.0. Firmware size is 3.8 GB.
Download Redmi k40 pro / k40 pro+ (haydn) China MIUI 12 V12.0.9.0.RKKCNXM Fastboot ROM with Android 11.0. Firmware size is 5.7 GB.