FRP automatically activates when a Google account is registered on an Android device. If the device is reset without removing that account, it locks the phone until the original email and password are provided.
Factory Reset Protection (FRP) is a security feature introduced by Google on Android devices running Lollipop 5.1 and higher. It is designed to prevent thieves from using a stolen phone by performing a factory reset. Without the previous owner’s Google credentials, the device becomes a brick—locked at the verification screen. bit.ly frp unlock tools