Before running any tool, you must install the correct drivers. The biggest failure point is Windows not recognizing your Unisoc phone in "Diag mode."
Unlike Qualcomm’s QPST or MediaTek’s SN Writer, Unisoc-specific tools (such as the Unisoc IMEI Writer , ResearchDownload , or SN Writer for Spreadtrum ) interact directly with the chipset’s diagnostic mode, often called "Download Mode" or "COM port mode." The process typically involves: unisoc imei repair tool