: Once finished, restart your computer to ensure the drivers are fully initialized. Compatibility & Specifications UGREEN CM390 Bluetooth 5.0 USB Adapter User Manual
Select the driver package corresponding to your Windows version ( 3. Installation Guide: How to Install CM390 Drivers
In third-party tests, the UGREEN CM390 with the Realtek driver achieved 1.8 Mbps file transfer speed, while the Microsoft driver capped at 800 Kbps.
The Ugreen Bluetooth 5.0 USB adapter CM390 is a useful device that enables users to add Bluetooth functionality to their computers or laptops. With its compact design, easy installation, and fast connection speeds, it is an ideal solution for users who want to connect their Bluetooth devices to their computers without the hassle of cables. By understanding the features, benefits, and potential issues of the adapter, users can get the most out of their device and enjoy a seamless Bluetooth experience.
After installation, run through this checklist:
, you can typically rely on plug-and-play functionality for modern systems, or download the official driver if manual installation is required.
Open the folder, find the setup.exe file, and double-click it.
and plug it into a USB 2.0 port instead, or use a short USB extension cable to physically separate the adapter from the back of your PC. 2. Audio Stuttering or Lag
However, a common point of confusion is the driver situation. Does it need one? Does Windows install it automatically? What if it doesn’t work?
If you encounter errors like "Device Not Recognized" or experience frequent disconnections, try these proven troubleshooting fixes. Fix 1: Disable Built-in Bluetooth
These systems require manual driver installation. The adapter will not function without the dedicated setup package. MacOS and Linux
The UGREEN Bluetooth 5.0 USB Adapter (Model CM390 / 80889) Go to product viewer dialog for this item.
Some common issues that users may experience with the Ugreen Bluetooth 5.0 USB Adapter CM390 driver include: