@13lenar Install the Last Android 10 Version ( Fastboot 4,4 GB ) for Merlin and Check Imei and Calls and SMS with Ubuntu.

https://xiaomifirmwareupdater.com/miui/merlin/stable/V12.0.10.0.QJOEUXM/

It's best to turn off all switches regarding locations and Google when installing Miui Android 10. Then switch on developer mode and run Ubuntu. Then at least theoretically everything should work. I used to have the device too, but now my sister is using it.

Bildschirmfoto zu 2023-11-15 00-35-38.png

@13lenar I don't about any native IR app on UT. I use it sucessfully with "Mi Remote" on Waydroid