While the device is "Plug and Play" on Windows 10 and 11, manual driver installation is often required for Windows 7/8.1 or to resolve stability issues. UGREEN CM390 Bluetooth 5.0 USB Adapter User Manual
He plugged it into his laptop’s lone USB port. For a moment nothing happened; the machine was an indifferent harbor. Then a barely audible chime: a device was detected. Windows spun its wheels trying a driver from its own stores and failed with a polite notification: “Driver not found.” ugreen bluetooth 50 usb adapter cm390 driver install
Find "Bluetooth" in the list, right-click your internal Bluetooth adapter, and select Disable device device.report 2. Driver Installation Methods While the device is "Plug and Play" on
Extract the ZIP file. Step 3: Open Device Manager (Right-click Start button → Device Manager). Step 4: Look for an unknown device under "Universal Serial Bus devices" or "Other devices". It might say "Unknown Device" or "Bluetooth Adapter". Step 5: Right-click the device → Update driver → Browse my computer for drivers → Let me pick from a list... → Have Disk . Step 6: Browse to the extracted folder and select the .inf file (usually rtbt.inf or rtl8761b.inf ). Step 7: Click OK → Next. Ignore the "This driver is not digitally signed" warning if it appears (for Windows 7/8). Then a barely audible chime: a device was detected
: Insert the UGREEN USB dongle into an available USB port. On Windows 8.1, 10, or 11, the system may automatically install the driver within seconds.
: Once installed, a Bluetooth icon should appear in the lower-right corner of your taskbar. Manual Driver Installation
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.