If you see any yellow warning triangle, the driver is missing or corrupted.
In an era where wireless peripherals are dominating the market—from noise-canceling headphones to precision gaming mice—having reliable Bluetooth connectivity on your desktop PC or older laptop is no longer a luxury; it’s a necessity. Unfortunately, many desktop computers lack built-in Bluetooth, and older laptops often ship with outdated Bluetooth 4.0 or 4.2 hardware.
Enter the UGREEN Bluetooth 5.0 USB Adapter (Model: CM390) . This tiny, affordable dongle promises to bring high-speed, long-range wireless connectivity to virtually any computer. However, a device is only as good as its software. The single most searched question surrounding this product is: “Where do I find the correct UGREEN Bluetooth 5.0 USB Adapter CM390 driver, and how do I install it?”
This article serves as your complete encyclopedia for the UGREEN CM390. We will cover hardware specifications, step-by-step driver installation for Windows 10 and 11, manual driver methods for legacy systems (Windows 7/8), troubleshooting common errors, and comparing it to other Bluetooth adapters. ugreen bluetooth 5.0 usb adapter cm390 driver
Since UGREEN uses the Realtek RTL8761B chipset, you can use Realtek’s generic driver.
Microsoft includes native Realtek Bluetooth 5.0 drivers in Windows Update. Upon first insertion:
If it is working correctly: You will see the Bluetooth icon in the system tray, and you can pair devices directly via Settings > Bluetooth & devices. Expand Universal Serial Bus devices
If it is not working automatically: Do not panic. Windows Update may have been disabled, or your specific build lacks the driver. That is when you need the manual driver.
There are two recommended methods to obtain the driver:
If your OS did not auto-install the driver, follow these steps. If you see any yellow warning triangle, the
Before downloading any driver, it’s crucial to understand that UGREEN does not manufacture Bluetooth chips. They purchase reference designs from chipset vendors. The driver you need depends entirely on the Bluetooth chip inside your specific revision of the CM390.
Key Specifications of the CM390:
Why this matters: Searching for “UGREEN CM390 driver” on UGREEN’s official website often redirects you to a generic Realtek driver package. This is because UGREEN leverages Realtek’s reference drivers.
Important Note: Do not confuse the CM390 with the older CM388 (Bluetooth 4.0) or the CM491 (Bluetooth 5.3). Drivers are not interchangeable.
The CM390 can work on Android TV boxes or phones with OTG support, but you cannot install a driver. Android must already support the chipset. Results vary. Do not buy this for Android.