For most users, the CM390 operates as a plug-and-play device on modern Windows systems. Here's what to do:
Open your web browser and navigate to the official .
I can provide tailored steps to get your hardware connected. Share public link
To prevent installation conflicts and ensure a smooth setup, complete the following preparatory steps: ugreen bluetooth 50 usb adapter cm390 driver install
Evan found the tiny UGREEN Bluetooth 5.0 USB adapter tucked under a stack of manuals like a secret. The silver dongle was no bigger than his thumb, but the label—CM390—felt like the name of a ship about to sail.
If you see LMP 8.x: You are running a generic driver. Re-do Method 3 to force the Realtek 5.0 driver.
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These codes mean Windows cannot communicate with the hardware properly.
Right-click the Realtek entry, select , and look under the Driver tab to verify that the driver provider is listed as Realtek and the status indicates the device is working properly. Step 5: Pairing Your First Bluetooth Device
Turn on your Bluetooth peripheral and put it into (usually indicated by a blinking LED light). On your PC, go to Settings > Bluetooth & devices . Toggle the main Bluetooth switch to On . Share public link To prevent installation conflicts and
| Problem | Solution | |---------|----------| | Device not detected | Try a different USB port (preferably USB 2.0 if USB 3.0 fails). | | Driver installs but Bluetooth doesn’t work | Uninstall any existing Bluetooth drivers (like from Intel or Broadcom) first. | | “Driver is unsigned” error (Windows 7/8) | Restart and disable driver signature enforcement (press F8 during boot). | | Can’t find the device in Device Manager | Check if the LED on the dongle lights up. If not, test on another PC. | | Bluetooth mouse/keyboard lag | Install the latest driver from Realtek (v1.9+ recommended). |
Follow these steps to get the official Realtek-based driver directly from UGREEN. Step 1: Download the Package
First, ensure you’ve restarted your computer after installation. Second, check Device Manager for any conflicts with an existing internal Bluetooth adapter—disable the internal adapter if present. Third, try unplugging the adapter and plugging it back in. If problems persist, uninstall the driver, restart, and reinstall.
Bluetooth 5.0 signals are highly susceptible to 2.4 GHz Wi-Fi and USB 3.0 data interference.