Open Device Manager > Bluetooth . If there is a yellow warning sign, right-click the adapter, select Update driver , and select "Search automatically for drivers".
To troubleshoot these issues, users can try:
| Problem | Solution | |--------|----------| | Adapter not detected at all | Try a different USB port. Avoid USB hubs. | | Bluetooth on/off toggle is missing | Uninstall the device in Device Manager, unplug, restart PC, then plug back in. | | Pairing fails or devices disconnect | Remove old Bluetooth drivers (from other dongles) first. Then install CM390 drivers fresh. | | Works in Windows but not in Linux | Install firmware-realtek as shown above. |
This is a known issue when connecting Bluetooth headphones or speakers. ugreen bluetooth 5.0 usb adapter cm390 driver
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The UGREEN Bluetooth 5.0 USB Adapter (Model: CM390) is a popular, compact dongle that adds wireless connectivity to desktop PCs and laptops. While it offers a stable connection for headphones, controllers, and keyboards, getting the correct driver installed is essential for optimal performance.
Wait a few seconds. Windows will automatically detect the new hardware and install the necessary drivers using its internal driver database. Open Device Manager > Bluetooth
Fully supported. Requires manual driver installation; plug-and-play is not available.
Up to 20 meters (65 feet) without obstacles Supported Profiles: A2DP, H2P, AVRCP, HID, PAN, DUN, OPP Supported Operating Systems
This is the most common question. Unlike some simple USB devices that work instantly, the CM390 requires a proper driver for a simple reason: it uses a specialized chip that isn't universally recognized by all operating systems. Avoid USB hubs
Select the driver package corresponding to your Windows version ( 3. Installation Guide: How to Install CM390 Drivers
The Ugreen Bluetooth 5.0 USB adapter CM390 is a device that enables users to add Bluetooth functionality to their computers or laptops that lack built-in Bluetooth capabilities. This adapter is particularly useful for those who want to connect their Bluetooth devices, such as headphones, speakers, or smartphones, to their computers without the hassle of cables.
For Windows 10/11 users needing basic audio and peripheral connectivity, this device is a cost-effective solution, provided they follow the installation steps strictly.
: If the adapter is not recognized, you can find the driver by searching for model number 80889 on the UGREEN Download Center.