Introduction: Why the UGreen CM390? In a world where desktop PCs often lack built-in wireless connectivity, the UGreen Bluetooth 5.0 USB Adapter (Model CM390) is a lifesaver. This tiny, nano-sized dongle promises to bring high-speed, low-latency Bluetooth connectivity to your Windows computer, allowing you to connect keyboards, mice, game controllers, AirPods, and speakers.
It is rare, but you may have a defective unit. UGreen has a solid 18-month warranty. Return it, but there is a 99% chance that following the manual registry fixes above will resurrect your dongle. Frequently Asked Questions (FAQ) Q: Does the CM390 work on Linux or Mac? A: On Linux (Ubuntu/Fedora), the Realtek RTL8761B driver is baked into Kernel 5.7+. It works plug and play . On Mac, it does not work natively due to Apple’s proprietary Bluetooth stack. ugreen bluetooth 50 usb adapter cm390 driver install
This article covers everything: automatic installation, manual driver hunting, fixing the dreaded "Code 10" error, and ensuring your adapter works with Windows 10 and 11. Before clicking "Install," you need to know one critical fact: UGreen does not manufacture Bluetooth chips. Introduction: Why the UGreen CM390
UGreen is a peripheral assembler. The CM390 typically uses a chipset. While UGreen provides a driver CD (which most modern PCs lack), Microsoft’s generic drivers often fail to initialize this specific chip correctly. It is rare, but you may have a defective unit
A: That is not a driver issue. That is Bluetooth codec negotiation. The CM390 supports SBC and aptX. Right-click your speaker in "Bluetooth & devices" > Properties > Disable "Handsfree Telephony" to force high-quality audio mode.
However, a common frustration among new users is the driver installation. Unlike a standard flash drive, this Bluetooth adapter requires proper driver setup to function. If you have searched for “UGreen Bluetooth 5.0 USB Adapter CM390 driver install” because your device isn’t working out of the box, you are in the right place.
After you get it working, use a free tool like Double Driver to back up the working Realtek driver. If you ever reinstall Windows, you can restore the driver in 10 seconds without an internet connection.