Ugreen Bluetooth 50 Usb Adapter Cm390 Driver Install May 2026

You installed the driver, but it still shows "Driver Error (Code 10)" or "Device cannot start." Here is why.

Cause: The CM390 uses a hideable boot mode. Some apps (like Bluetooth tray apps) hide audio devices.

Fix:

Here is the secret UGREEN doesn't print on the box: The CM390 uses a Realtek chipset (usually the RTL8761B). You do not need "UGREEN software" – you need the Realtek Bluetooth driver. ugreen bluetooth 50 usb adapter cm390 driver install

Step-by-step manual install:

Here are the three ways to get the CM390 working, ranked from easiest to most thorough.

Cause: The Bluetooth Support Service is disabled. You installed the driver, but it still shows

Fix:

The CM390 is too small to come with a CD. If you lost the manual, scan the QR code on the back of the plastic packaging. It usually links directly to: driver.ugreen.com (Search for "CM390").

Sometimes the driver installs, but Windows uses a generic Microsoft driver that lacks Bluetooth 5.0 features. Here is how to force the correct driver. Here is the secret UGREEN doesn't print on

Step 1: 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.

Result: Your device now uses the manufacturer driver instead of Microsoft's generic stack.