@MrT10001 It is a TB-X306F, but the 2GB Android 10 version. The installer recognised it (but made no further check about ram or Android version).
I flashed Android 11 onto it, which seemed to work, and then installed UT. Almost everything seems to work, although sometimes not fluently, but the sound is not working at all. I have to try with usb audio or bt audio. It might be that the audio hardware got upgraded for the Android 11 models and the drivers don't understand the old hardware. I would have to re-flash Android 11 to check if sound works on Android 11. It worked fine on Android 10.