Method A: Using the Downloaded Installer (Recommended)
Method B: Manual Update via Device Manager (If the installer fails)
The ugreen bluetooth 50 usb adapter cm390 driver install process is rarely smooth, but it is always solvable. The golden rule: ignore the "plug and play" marketing. Use the official UGREEN driver tool (Method 4) or the manual Realtek INF install (Method 2).
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.
Final Recommendation: Bookmark this guide. If you ever reinstall Windows, come back to Section 4. And always, always use a USB 2.0 port or an extension cable.
Having a unique error? Leave a comment below (or on the original forum where this article is posted) with your Windows version and Device Manager error code. ugreen bluetooth 50 usb adapter cm390 driver install
To install the driver for your UGREEN Bluetooth 5.0 USB Adapter (Model: CM390)
, follow these steps to ensure a stable connection on Windows systems. 1. Pre-Installation (Crucial Step) Before plugging in the adapter, you must disable your computer's built-in Bluetooth (if it has one) to avoid driver conflicts. Device Manager on your PC.
Find "Bluetooth" in the list, right-click your internal Bluetooth adapter, and select Disable device device.report 2. Driver Installation Methods
You can install the driver using the physical media included with the product or by downloading it from the official site. Question about Ugreen CM390 - Galaxus
Linux integration relies on kernel modules and firmware blobs. Method A: Using the Downloaded Installer (Recommended)
Kernel Support:
The RTL8761B chipset is supported in modern kernels (5.x+). The driver module is typically btusb.
Firmware Installation: If the device is recognized but fails to pair, it usually indicates missing firmware binaries.
Warning: Back up your registry before proceeding.
The installation of the UGREEN CM390 driver is a process that bridges the gap between generic OS support and specific hardware optimization. By identifying the Realtek RTL8761B architecture and manually deploying the correct binary files, users can unlock the full potential of Bluetooth 5.0. Proper installation not only resolves connectivity errors (Code 43) but also ensures the stability required for high-bandwidth applications such as wireless audio streaming and data transfer. This paper establishes that for "solid" performance, reliance on automatic plug-and-play mechanisms should be superseded by manual, chipset-specific driver management.
If you see a yellow triangle in Device Manager, here is the fix. Method B: Manual Update via Device Manager (If
After the ugreen bluetooth 50 usb adapter cm390 driver install is complete, check that you actually have Bluetooth 5.0.
Method A: Device Manager → Bluetooth → Right-click your adapter → Properties → Advanced tab. Look for "LMP (Link Manager Protocol) version".
Method B: Download "Bluetooth Version Detector" (free tool). Run it. It will show the active version.
If you see LMP 8.x: You are running a generic driver. Re-do Method 3 to force the Realtek 5.0 driver.
The CM390 typically uses a Realtek or MediaTek chipset. On Windows 10/11, drivers usually install automatically. If not, follow these steps: