Fix Bluetooth disappeared in Windows | Microsoft Support

Solution 2: Install the latest Bluetooth drivers If you recently upgraded to Windows 10 or installed updates, your current Bluetooth driver may not be compatible. Check for updated drivers. Select Start, type Device Manager, and select it from the results. In Device Manager, select Bluetooth, and then select the Bluetooth adapter name, which may include the word “radio.” Press and hold (or …

https://support.microsoft.com/en-US/Windows/Hardware/Bluetooth/fix-bluetooth-disappeared-in-windows