The Stable update V18.104.22.168.QJQMIXM has been officially released for Redmi Note 9 4G/9T / 9 Power (codename is lime). 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 9t (lime) Global MIUI 12 V22.214.171.124.QJQMIXM Recovery ROM with Android 10.0. Firmware size is 2.5 GB.
Download Redmi 9t (lime) Global MIUI 12 V126.96.36.199.QJQMIXM Fastboot ROM with Android 10.0. Firmware size is 4.4 GB.