There are very few device-specific custom ROMs for the Y9 Prime. Instead, users must use Generic System Images (GSI) Android Versions
Customization: Change everything from the system fonts and accent colors to the layout of your status bar and navigation gestures. Top Custom ROMs for Huawei Y9 Prime huawei y9 prime custom rom
Baseband unknown, no SIM card detected.
Here is the critical warning. Unlike Xiaomi or OnePlus, Huawei locked down bootloader unlocking in mid-2018. The Y9 Prime (2019) falls into the "dark era." There are very few device-specific custom ROMs for
Ensure you are on the latest official firmware, which for most regions is Android 10 with EMUI 10 or Magic UI 2.1 . Check for updates via Settings > System & updates > Software update . Here is the critical warning
You will not find official builds of popular ROMs like LineageOS or Pixel Experience tailored specifically for the Y9 Prime.