The Xiaomi Mi A3 has received a new update, this time for the European variant of the Android One handset. Android 11 development has apparently begun for the device too, although it will probably be the last OS update for the Mi A3.
https://www.notebookcheck.net/The-Xiaomi-Mi-A3-receives-a-new-update-as-Android-11-development-begins.496532.0.html
I don't know how to update MiA3..
If everyone knows please help me
Go to settings, system, advanced options, and finally check if you have a system update.