Most Android devices with USB OTG support will recognize the CM390 automatically if your kernel has Bluetooth USB HCI support. No manual driver installation is possible on Android.
Searching for “UGREEN CM390 driver” on UGREEN’s official website often redirects you to a generic Realtek driver package. This is because UGREEN leverages Realtek’s reference drivers. ugreen bluetooth 5.0 usb adapter cm390 driver
Confirm any pairing codes on both devices to complete the connection. Most Android devices with USB OTG support will