@Eric-H thanks, my questions now are being solved at first - do i have to flag this thread as 'solved'?

@Eric-H ok
Thank you, i think i understand, but one last question please: is it recommended not to upgrade and leave the phone in Android 10 or otherwise is it possible to downgrade to the needed V12.0.9.0.QJGMIXM Adroid 10-Version?

Hello, i am a Newbie interested in UT. Today i have ordered a Xiaomi X3 NFC but i am not sure what is meant about the Surname 'Surya' as it's described in the ubports installer. Are there different kinds of X3 NFC? And if there are others, isn't it then possible to flash them? Thank you for your answers and especially for the your encouraged work to enable this fabulous OS.