I have also installed it in my UMI. I was in the Last stable MIUI12 build. The Script for the Update without loosing data didnt work for me and ended in a bootloop. So Ive reflashed it with wipe and everything ist working finde. Thx devs.
Installed 12.2.10 on my MI10. No issues so far, except the double clock error on AOD when using the weather super wallpaper. But again safetynet failed (cts profile match failed). On last version 12.2.9 it was working.
You don't need to format data if you are just upgrading. For me it works.
But I have a new bug: Mi10 on 12.2.7 the AOD is disabling itself after some time. I'm not sure if it is relating to new notifications. When I unlock the device and lock it again AOD is showing up again.
So I got the same issue after trying to install 12.2.7 on my Mi10: Device just started into fastboot.
Here is my solution (device was already in fastboot because of the issue):
Download new TWRP version (Download) on PC
open cmd prompt
open the unzipped folder
type in fastboot flash...