I was puzzled by this problem for a long time, and finally solved it. I made a temporary record to avoid forgetting that the ThinkPad was in my hand next time. The installed Windows7 was normal in the Windows10 environment, so the hardware fault was eliminated. However, the driver was deleted from the ThinkPad official website, but it did not improve. The device could be paired normally, but it was unable to use, In any case, you can't use the Bluetooth headset. Click on the small speaker, and no new audio device appears in the playback device. The online saying is to enable the corresponding service in the device properties, but I found that there is no similar service name in my own, two are unknown services, and the audio service is never available. Later, I accidentally turned to a folded answer, Then directly from