Because the Y6 Prime 2018 supports Project Treble, it can often run Generic System Images (GSIs) of Android 9 and 10. The Bootloader Challenge

To install a Huawei Y6 Prime custom ROM, you need the following tools:

: Pure Android builds (Android 9, 10, or 11) that are compatible with Project Treble-supported devices. 3. Basic Installation Steps Huawei-Y6-and-Y6-Prime-(2018).md - GitHub