Despite the fact that in China Redmi K20 has been running Android 11 with MIUI 12.5 for a long time, the global version of the device started receiving fresh firmware only now, and even then not in full force.
According to Gizmochina, Xiaomi has announced an Android 11 update for the Xiaomi Mi 9T. The firmware received the build number V188.8.131.52.RFJMIXM. That is, it is still based on the MIUI 12 shell. It is not clear when the device will update to MIUI 12.5.
As for the changelog, it includes the current security patch and some innovations in Android 11. For example, improved privacy and security.
The update came out with the Stable Beta and is available for a limited number of users so far. If there are no errors in the software, then it will be released a little later for all device owners.