Before downloading anything, let Windows do the heavy lifting.
☐ Avoid USB 3.0 ports (blue inside). Use USB 2.0 (black/grey). USB 3.0 emits radio noise that kills Bluetooth 2.4GHz signals. ☐ USB Extension cable: If the dongle is plugged into the back of a metal tower PC, use a short USB 2.0 extension cable to bring the adapter into open air. This doubles range. ☐ Disable onboard Bluetooth: If your laptop has built-in Bluetooth, disable it in BIOS or Device Manager. Two active Bluetooth radios will conflict. ☐ Run the official UGREEN tool (Method 4) even if Windows says the driver is installed. It cleans orphaned registry keys. ☐ Restart, don't shut down. Windows Fast Startup often prevents Bluetooth drivers from loading correctly. After install, do a full Restart (not Shutdown + Power on). ugreen bluetooth 50 usb adapter cm390 driver install
You installed the driver, but it still shows "Driver Error (Code 10)" or "Device cannot start." Here is why. Before downloading anything, let Windows do the heavy
UGREEN Bluetooth 5.0 USB Adapter (Model CM390) is a compact dongle designed to add high-speed, long-range wireless connectivity to PCs. While newer Windows versions may handle it automatically, a manual driver installation is often required for full compatibility on Windows 7, 8.1, and 10. device.report 1. Driver Installation Methods You can install the drivers through two primary methods: Official Website (Recommended): Navigate to the UGREEN Download Center Search for product model Download the ZIP file containing the Realtek Bluetooth Drivers Extract the files and run Provided Driver CD: Insert the CD into your computer's drive. Locate the folder corresponding to the and double-click to begin the UGREEN installation wizard 2. Step-by-Step Setup Guide UGREEN CM390 Bluetooth 5.0 USB Adapter User Manual ☐ Disable onboard Bluetooth: If your laptop has