Factory Reset Protection (FRP) is a security feature introduced by Google (Android 5.1 Lollipop and higher). If a device is factory reset via recovery mode without removing the Google account beforehand, the phone locks itself until the previous Google credentials are entered.
) while connecting it to the computer via USB to enter a diagnostic or download mode. Execute Bypass zte frp unlock tool
Sigma Key is a hardware dongle/software combo. It is the most expensive but the most reliable. Factory Reset Protection (FRP) is a security feature
: A professional dongle-based tool that offers one-click FRP removal for almost all Android brands, including a wide range of ZTE models. SamFw Tool (Version 5.4+) MediaTek or UNISOFT).
Choose as the brand and identify your device's processor (e.g., MediaTek or UNISOFT).