The Stable update V18.104.22.168.RKHCNXM has been officially released for Redmi K40 / Mi 11X / POCO F3 (codename is alioth). 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.
Download Redmi k40 (alioth) China MIUI 12 V22.214.171.124.RKHCNXM Recovery ROM with Android 11.0. Firmware size is 3.7 GB.
Download Redmi k40 (alioth) China MIUI 12 V126.96.36.199.RKHCNXM Fastboot ROM with Android 11.0. Firmware size is 5.3 GB.