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The Unknown device Bluetooth error message on Windows 11/10, means Windows is unable to detect the device connected to your computer.
The BthA2DP.sys (Bluetooth A2DP) is a system file associated with Bluetooth drivers. Here's how to fix the BthA2DP.sys Blue Screen in Windows.
Scroll down and click Run next to Bluetooth. Step 2: Follow On-Screen Instructions Windows will detect and attempt to fix problems automatically.
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