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Check Device Manager, re-assign the COM port between 1-4, and use a shorter USB cable.

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This error often points to a hardware compatibility issue. It's commonly reported when trying to use a clone Xprog 612 with certain MCUs (like those found in some dashboards). This may be a limitation of your specific unit. Check Device Manager, re-assign the COM port between

— Ensure your USB drivers are installed correctly via the Windows Device Manager. You may need to disable driver signature enforcement on Windows 7. Check Device Manager