This device is notable for being one of Huawei’s last smartphones to launch with Google Mobile Services (GMS) in many markets, alongside its signature pop-up camera design.

huawei-y9-prime-2019-firmware-guide

EMUI 12 for this device is still based on Android 10 (API 29). It is not Android 11 or 12. Do not expect Android 11 GSI (Generic System Image) to work perfectly without vendor modifications.