@MrT10001 I searched but couldn't find it

@MrT10001 I actually found my version on Gitlab, it's the Halium 9

@Ian In the 'about' section, I only find the serial number, the Wi-Fi and Bluetooth address and the storage.

@kugiigi I don't know where I can find my version of UT, but I think that I'm not in the last version

I also have another problem: when I close the cover of my tablet, it turns on instead of off.

@messayisto I tried but it didn't work

@MrT10001 It's with UT. The round on the lock screen displays nothing even when I click on it.

@MrT10001 It works ! Thank you very much ! But I've got a little problem : the InfoGraphic on the lock screen displays nothing, even when I click on it. Is it normal?

@MrT10001 Ok, thanks ! I'll give it a try and let you know

@MrT10001 Oh, ok. But I can't find the official Android 9 ROM, can I flash something else such as LineageOS (the version based on Android 9 of course) ?