A built-in security feature introduced in Android 5.1. It automatically links a device to the owner's Google account. If the device is hard-reset via Recovery Mode rather than the system settings menu, it requires the password of the previously synced Google account to proceed.
Factory Reset Protection (FRP), is a security feature on Android devices with Android OS Version 5.1 (Lollipop) and higher. samsung.com gsmplusvip frp hot
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The system ties the hardware identifier to the owner's Google account components on a dedicated secure storage partition. A standard hard reset via recovery mode does not wipe this partition. Key Hardware and Software Compatibility gsmplusvip frp hot