Before diving into the driver installation, it's helpful to know what you're working with. The UGREEN CM390, also known by the product number 80889, is a tiny USB dongle that plugs into your computer's USB port. It uses the Realtek RTL8761BUV chipset, a reliable and widely-supported component that delivers stable and fast Bluetooth 5.0 performance. This version offers significant improvements in speed, range, and energy efficiency compared to older Bluetooth standards.
Once the download finishes, follow these steps to execute the installation properly: 1. Extract the Files ugreen bluetooth 50 usb adapter cm390 driver install
If you inserted the dongle and see "Unknown USB Device (Device Descriptor Request Failed)" or nothing happens, you need to follow the manual steps below. Before diving into the driver installation, it's helpful
He plugged it into his laptop’s lone USB port. For a moment nothing happened; the machine was an indifferent harbor. Then a barely audible chime: a device was detected. Windows spun its wheels trying a driver from its own stores and failed with a polite notification: “Driver not found.” He plugged it into his laptop’s lone USB port
Plug your Ugreen CM390 Bluetooth adapter into an available USB 2.0 or USB 3.0 port on your computer. (For desktop PCs, using a rear motherboard port is recommended for better power delivery).
The UGREEN CM390 also works with Linux-based operating systems, although it typically requires some manual setup. The process often involves downloading a Linux driver package (such as 20201202_LINUX_BT_DRIVER ), extracting it, and using terminal commands like cd , make install , and sudo cp to copy firmware files (e.g., rtl8761bu_fw ) to the /lib/firmware/ directory. A system restart is then usually required. You can find detailed guides for specific distributions like Ubuntu online, often using the product number "80889".
Always download the driver directly from the manufacturer to avoid malware or outdated files. Visit the official .