If an Android 9 device is factory reset without removing the Google account, it triggers Factory Reset Protection (FRP). GSMPrime provides the necessary infrastructure to handle this:
Android 9 introduced heavily upgraded security measures that significantly changed how technicians interact with the operating system: gsmprime. online apps-android-9
Multi-brand unlocking utility for structural partition resets. Multi-brand (MTK/Qualcomm) If an Android 9 device is factory reset
What does the device use (Qualcomm, MediaTek, Exynos, etc.)? the device locks.
If a user forgets their Google account credentials on Android 9 after a hard hardware reset, the device locks.