Installing the verified Jieli BR21 driver is not the final goal; it is the key that unlocks the hardware. Once the driver is active, you can:
: If the volume stays at 0 or 100 with no middle ground, it may be a conflict with Absolute Volume
If your device has Bluetooth, the blue LED typically flashes to indicate pairing mode. It often acts only as an audio transmitter/receiver and will not show up in your PC's Bluetooth menu like a standard mouse or keyboard. Windows Recognition: