| Issue | Likely Cause | Solution | | :--- | :--- | :--- | | | Driver conflict or corrupted service. | Uninstall the device in Device Manager, unplug the dongle, restart PC, and plug it back in. | | Audio Cutting In/Out | Interference from USB 3.0 ports or Wi-Fi. | Plug the adapter into a USB 2.0 port or use the included USB extension cable (if provided) to move it away from the PC case. | | Pairing Fails | Bluetooth Support Service is disabled. | Press Win+R , type services.msc . Find "Bluetooth Support Service" and ensure it is set to "Automatic" and is "Running". |
If you’ve just picked up the UGREEN Bluetooth 5.3 USB adapter (often labeled as “CM390” or “50944”), you might be looking for a driver CD or a download link. driver ugreen bluetooth 53
If your device is not working automatically ("Bluetooth could not start" or missing icon), follow this procedure: | Issue | Likely Cause | Solution |
Often powered by the ATS2851 built-in chip for reliable performance. | Plug the adapter into a USB 2
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