Microsoft has pushed stable Realtek drivers via Windows Update. Here is how to force Windows to find them.
Success indicator: After reboot, "Bluetooth" appears as a category in Device Manager, and the system tray icon appears.
The CM390 typically uses a Realtek or MediaTek chipset. On Windows 10/11, drivers usually install automatically. If not, follow these steps: ugreen bluetooth 50 usb adapter cm390 driver install
Warning: Back up your registry before proceeding.
Before downloading anything, let Windows do the heavy lifting. Microsoft has pushed stable Realtek drivers via Windows
Step 1: Plug the UGREEN CM390 into a USB port (preferably USB 2.0, not 3.0, as 3.0 can cause interference). Step 2: Open Settings → Update & Security (Windows 10) or Settings → Windows Update (Windows 11). Step 3: Click "Check for updates" . Step 4: Wait. Windows will download "Realtek Bluetooth Adapter" or "Generic Bluetooth Radio" via Optional Updates.
Pro Tip: On Windows 11, go to Settings → Windows Update → Advanced options → Optional updates → Driver updates. Look for "Realtek Semiconductor Corp. – Bluetooth – [Version Number]" and check the box. Click "Download & install". Success indicator: After reboot, "Bluetooth" appears as a
Result: After a reboot, your adapter should appear in Device Manager under "Bluetooth".