If Windows Update fails, you need the generic Realtek driver. UGREEN does not host drivers on their main site (ironically), but the chipset manufacturer does.
The installation of the UGREEN CM390 driver is a process that bridges the gap between generic OS support and specific hardware optimization. By identifying the Realtek RTL8761B architecture and manually deploying the correct binary files, users can unlock the full potential of Bluetooth 5.0. Proper installation not only resolves connectivity errors (Code 43) but also ensures the stability required for high-bandwidth applications such as wireless audio streaming and data transfer. This paper establishes that for "solid" performance, reliance on automatic plug-and-play mechanisms should be superseded by manual, chipset-specific driver management. ugreen bluetooth 50 usb adapter cm390 driver install
: If your computer has built-in Bluetooth, disable it first through Device Manager to avoid conflicts with the new adapter. If Windows Update fails, you need the generic Realtek driver
A: USB port power saving. Go to Power Options → Change plan settings → Change advanced power settings → USB settings → USB selective suspend setting → Disable. : If your computer has built-in Bluetooth, disable
This is rarely a driver issue.