Rich, here are the steps about how to reinstall the drivers using Device Manager on PC, you may have a try.
1. Power on the aircraft and connect it to PC via USB cable;
2. Select the Start button on PC, type Device Manager, and select it from the list of results;
3. Expand one of the categories to find the name of Unknown device, then right-click it, and select Update Driver;
4. Select Browse my computer for driver software andclick Browse and go to where the drivers located.
5. Click Next and then the drivers will be installed.
After installing the drivers, re-plug the USB cable and launch DJI Assistant 2, then the Unknown Device should be gone from the Device Manager and DJI Assistant 2 should recognize the aircraft. If the issue still persists, please reboot the PC.
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