Once installed correctly, the CM390 is a rock-solid adapter. You will enjoy low-latency audio, simultaneous connections to multiple devices (keyboard + mouse + headphones), and the full 20-meter range of Bluetooth 5.0.
A: USB port power saving. Go to Power Options → Change plan settings → Change advanced power settings → USB settings → USB selective suspend setting → Disable. ugreen bluetooth 50 usb adapter cm390 driver install
Go to the official UGREEN support page: support.ugreen.com (Search for "CM390"). Step 2: Download the "UGREEN Bluetooth Driver Installer" (approx 35MB). Step 3: Run the .exe as Administrator (Right-click → Run as administrator). Step 4: Click "Install Driver" . The tool will automatically detect the CM390. Step 5: Wait for the command prompt window to close. Do not unplug the dongle. Step 6: Restart your PC. Once installed correctly, the CM390 is a rock-solid adapter
The UGREEN Bluetooth 5.0 USB Adapter (Model: CM390) is one of the most popular dongles on the market. It promises instant wireless connectivity for mice, keyboards, headphones, and game controllers. However, the phrase is searched thousands of times per month. Why? Because despite being "plug-and-play" in theory, Windows often fails to automatically load the correct driver. Go to Power Options → Change plan settings