Ugreen Bluetooth 5.0 Usb Adapter Cm390 Driver Review
UGREEN Bluetooth 5.0 USB Adapter (CM390) , the driver can be downloaded directly from the official UGREEN Download Center by searching for product model Driver Installation Guide
While Windows 10 and 11 often recognize the adapter automatically, manual installation is required for full functionality on older systems like Windows 7. Official Download : Visit the UGREEN Support Page to find the latest version. Alternative Source ugreen bluetooth 5.0 usb adapter cm390 driver
: A verified driver package (approx. 73 MB) is also hosted on OEMDrivers Installation Steps Plug the adapter into a USB 2.0 or 3.0 port from the downloaded folder or provided CD. Follow the on-screen prompts and restart your computer once finished. Troubleshooting : If you have built-in Bluetooth, you must disable it in the Device Manager before the UGREEN adapter will work. Key Features UGREEN CM390 UGREEN Bluetooth 5
is a compact solution for adding wireless connectivity to PCs that lack native Bluetooth. UGREEN Bluetooth 5.0 Adapter CM390 Drivers 29-Aug-2024 — Common Problems & Fixes | Problem | Solution
Common Problems & Fixes
| Problem | Solution |
|--------|----------|
| Adapter not detected at all | Try a different USB port. Avoid USB hubs. |
| Bluetooth on/off toggle is missing | Uninstall the device in Device Manager, unplug, restart PC, then plug back in. |
| Pairing fails or devices disconnect | Remove old Bluetooth drivers (from other dongles) first. Then install CM390 drivers fresh. |
| Works in Windows but not in Linux | Install firmware-realtek as shown above. |
Issue 5: Driver Installation Fails with “Third-party INF does not contain digital signature information”
Cause: Windows Driver Signature Enforcement (Windows 7/8, or older Windows 10 builds). Solution:
- Reboot Windows, press F8 (or Shift + Restart > Troubleshoot > Advanced > Startup Settings > Restart > Disable driver signature enforcement).
- Install driver, then reboot normally.
Part 10: Final Checklist – Is Your UGREEN CM390 Driver Working Perfectly?
After installation, run through this checklist:
- Device Manager: No yellow exclamation marks.
- Bluetooth Tray Icon: Right-click > "Add a Bluetooth Device" – does the window open?
- Pairing Test: Pair a known device (e.g., Sony XM5 headphones or Logitech MX Master 3).
- File Transfer: Send a small JPG from your phone to your PC. If it works, the OBEX driver is loaded.
- Audio Quality: Play music through Bluetooth headphones. Try a YouTube video. Is there a stutter? (If yes, see Issue #2 above).
- Range Test: Walk 10 meters away (30 feet). Does the connection drop? If it drops, ensure you aren’t using a USB 3.0 hub.
Compatibility and limitations
- Not all sellers’ listings are accurate; chipsets vary between production batches — check device vendor/product ID (lsusb or Device Manager) to confirm chipset.
- Some sellers rebrand devices with different internal chips (e.g., Realtek, Broadcom, Qualcomm, or CSR variants); drivers differ accordingly.
- Full advanced features (codec support, long-range modes, offloading) depend on chipset and driver/stack support.
Recommendation
- If you need guaranteed compatibility on Windows 10/11 for general peripherals (mouse, keyboard, audio, BLE devices), try the adapter and let Windows Update install drivers; if issues occur, get the vendor driver matching the exact product ID.
- For macOS or Android OTG use, prefer adapters explicitly advertised as supported for those OSes or use built-in Bluetooth.