If Windows Update fails, you need the generic Realtek driver. UGREEN does not host drivers on their main site (ironically), but the chipset manufacturer does.
Technical Implementation and Analysis of the UGREEN CM390 Bluetooth 5.0 USB Adapter Driver Architecture ugreen bluetooth 50 usb adapter cm390 driver install
If your laptop or desktop already has an internal Bluetooth chip, you must disable it first. Go to Device Manager > Bluetooth , right-click the internal adapter (e.g., Intel Wireless Bluetooth), and select Disable device . If Windows Update fails, you need the generic Realtek driver
If your package included a mini-CD and your PC has an optical drive, you can use the files located there. UGREEN CM390 Bluetooth 5.0 USB Adapter User Manual Go to Device Manager > Bluetooth , right-click
Open Device Manager. Step 2: Expand "Bluetooth" . Step 3: Right-click "Generic Bluetooth Radio" → Properties → Driver tab. Step 4: Click "Update Driver" → "Browse my computer..." → "Let me pick from a list..." . Step 5: Uncheck "Show compatible hardware". Step 6: In the left pane, select "Realtek Semiconductor Corp." . Step 7: In the right pane, select "Realtek Bluetooth 5.0 Adapter" or "Realtek Radio" . Step 8: Click Next. If you see a compatibility warning, click Yes.