Install usb-modeswitch to handle the transition from a storage/dummy device to a functional Bluetooth interface. Common Issues and Troubleshooting Potential Cause Device is in "driver-carrier" mode.
Ensure the device is set to "Stereo" (A2DP) rather than "Hands-free AG Audio" in Sound Settings. For Developers: Programming the Chip jieli br21 driver
Click the tab and select Hardware Ids from the dropdown. You will see a string like USB\VID_E5B7&PID_0811 . Install usb-modeswitch to handle the transition from a
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