When successful, Device Manager will show a COM port (e.g., COM3).
Keep in mind that the Sprd U2S Diag Reset Tool is a specialized utility, and its usage is typically limited to professional technicians and repair shops. If you're not a trained technician, it's best to seek professional help for mobile device repairs or issues.
SPRD U2S Diag Reset Tool is a utility designed for mobile devices powered by Spreadtrum (now Unisoc) chipsets. It primarily interacts with the "SPRD U2S Diag" port, a specialized communication mode used for diagnostic tasks, firmware flashing, and bypassing security locks. Quectel Forums Purpose and Functionality
If a reset causes a boot loop, you may need to use the SPD Upgrade Tool to flash the official stock firmware. Final Verdict