If Device Manager displays the COM port properly but your servicing tool remains idle, run the utility software with administrative privileges. Ensure no other flashing software or peripheral management suites are running in the background, as they can lock access to the active COM port.
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Without the correct driver, flashing tools like the Spreadtrum Upgrade Tool or Research Download Tool will fail to detect your device, often resulting in errors or bricked hardware. This comprehensive guide provides everything you need to safely download, install, and troubleshoot the verified SPD Driver R420. What is the SPD Driver R420? If Device Manager displays the COM port properly