Repair - Mt6771 Imei
The official MediaTek SN Write Tool can be used on a PC. You will need the specific "Database" files (usually named BPLGU... and APDB... ) that match your exact firmware version to successfully write the number back to the hardware.
Open the MTK Auth Bypass tool and click on Crash Preloader or Bypass Security . Mt6771 Imei Repair
Launch your preferred service tool (e.g., UnlockTool, Pandora Box software, or NCK Dongle). The official MediaTek SN Write Tool can be used on a PC