You have a fake or counterfeit UGREEN adapter. Real UGREEN CM390 uses Realtek. Knockoffs use cheaper CSR chips. Return it to the seller.
For the adapter to function correctly, the appropriate driver must be installed on your system. Automatic Installation Windows 10 Windows 11 ugreen bluetooth 5.0 usb adapter cm390 driver
: If your computer has built-in Bluetooth, you must disable it in the Device Manager before installing the UGREEN adapter to avoid conflicts. You have a fake or counterfeit UGREEN adapter
depend on your operating system. While modern versions of Windows often feature automatic detection, older systems or specific configurations may require a manual setup. ugreen bluetooth 5.0 usb adapter cm390 driver