to fit the ROM files. If you do not do this, you will encounter "Status 7" errors during installation or the ROM will install but fail to boot.
There are various ports of AOSP (Android Open Source Project) or OmniRom.
Custom ROMs for the Huawei MediaPad T3 7 (BG2-U01) : What You Need to Know Huawei MediaPad T3 7 (BG2-U01)
Finding official support for the BG2-U01 can be difficult. Most users rely on unofficial builds: