If you have ADB enabled and the device is rooted, you can force the port open via terminal commands. Connect the phone to the PC with enabled.
Entering "Diag Mode" (Diagnostic Mode) on (Spreadtrum/Unisoc) chipsets is a critical step for service tasks like IMEI repair, firmware flashing, or network calibration. Since these devices don't have a universal "code," the method depends on whether you are using professional service tools or a manual connection. 1. Manual Hardware Connection (No Box) enter diag mode spd