Usb Adapter Cm390 Driver Install | Ugreen Bluetooth 50

To install the UGREEN Bluetooth 5.0 USB Adapter (CM390)

Table of Contents

  1. What is the UGREEN CM390?
  2. Does the CM390 Need a Driver? (The Truth)
  3. Method 1: Automatic Windows Update Installation
  4. Method 2: Manual Driver Install (Realtek Chipset)
  5. Method 3: The "Generic Bluetooth Radio" Fix
  6. Method 4: Using the Official UGREEN USB Driver Tool
  7. Troubleshooting: Code 43, Code 10, and Hidden Devices
  8. Windows 11 vs. Windows 10 vs. Linux
  9. How to Verify Bluetooth 5.0 is Active
  10. Final Checklist & Pro Tips

For Linux users, the CM390 driver installation process may vary depending on the distribution: ugreen bluetooth 50 usb adapter cm390 driver install

Problem 2: Bluetooth Toggle is Missing in Windows Action Center

Cause: The Bluetooth Support Service is disabled. To install the UGREEN Bluetooth 5

Step-by-step manual install:

  • Do not use random driver sites.
  • Go to Microsoft Update Catalog (www.catalog.update.microsoft.com).
  • Search for Realtek Bluetooth 5.0 Driver.
  • Look for a driver dated within the last year that mentions "RTL8761B" or "USB\VID_0BDA&PID_8771".
  • Download the .cab file.

Troubleshooting Tips

  • Error 10 (Device Cannot Start): If you see this in Device Manager, try a different USB port. USB 3.0 ports are preferred for power stability, but sometimes switching to a USB 2.0 port can resolve compatibility glitches during the initial handshake.
  • Disconnecting Audio: If the audio cuts out, go to Device Manager > Sound, video and game controllers > Realtek Bluetooth Audio > Properties > Power Management, and uncheck "Allow the computer to turn off this device to save power".
  • Wi-Fi Interference: If you experience dropouts, try moving the adapter away from your Wi-Fi dongle or router, as Bluetooth and 2.4GHz Wi-Fi share similar frequencies.