Because full AOSP-based ROMs (LineageOS, crDroid, etc.) are virtually nonexistent for this device, the "custom ROM" scene has adapted into something else:
If you find a used T3 10 in a drawer, don't try to turn it into a flagship. Instead, install Nova Launcher , disable every Huawei service you can find, and use it as a dedicated e-reader or music player. That is the only ROM that works 100% of the time. mediapad t3 10 custom rom
For the average user, it’s a slow, laggy web browser. For the custom ROM enthusiast? It is a locked fortress. Because full AOSP-based ROMs (LineageOS, crDroid, etc