My Ubook X arrived yesterday I can say that despite CHUWI’s verdict, it fully supports Windows 11.
What worked for me without any driver issues was to
- Install all Windows 10 updates and upgrades until there are no more available (20H1 takes extremely long)
- Remove all update files (Clean Disk utility)
- Install Windows 11 upgrade assistant
- Install graphics driver from Intel: Intel® Celeron® Processor N4100 (4M Cache, up to 2.40 GHz)
This one is more recent than the version installed using Windows Update or Windows 11 https://downloadmirror.intel.com/677976/igfx_win_100.9955.exe
Flickering lines were appearing occasionally from unboxing until only when the Microsoft Store is opened under Windows 11. The graphics driver from Intel fixed that after a few hours of use.
Everything on my machine is working and it’s more faster and responsive than under Windows 10. Battery life is better too.