Windows chimed—a generic, hollow sound. The Device Manager flickered. "Unknown Device."
Users often encounter a "Driver is unavailable" error or find that their dongle is recognized as a "Generic Bluetooth Radio" in Device Manager. Common symptoms of a missing or incorrect driver include: The device connects but provides no audio output. csr8510 a10 driver
Here is the useful information regarding the driver. Windows chimed—a generic, hollow sound
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