Bluetooth device disappeared on Windows 10 Asus ZenBook

Solution 1:

If it is a Windows update that caused your Bluetooth drivers to stop working, then you should consider restoring Windows to a previous version where you know for sure that Bluetooth was functioning normally. You can see recovery options to restore previous versions of Windows here, and if you are going to go this route then ensure you back up any important files that might have changed since this point.

If that is successful in fixing the Bluetooth issues and everything is working normally, then you could temporarily disable automatic Windows updates via the registry until you're certain that updating Windows again will not break your Bluetooth. If you are going to update again at this point then you might want to look into creating a system restore point to more easily restore previous states of Windows, should anything break again in the future after updating Windows.

Hope you get this fixed, as this looks like an annoying issue to have to deal with!

Solution 2:

I've heard this helps sometimes with missinsg/unknown devices. In Device Manager, if I select Intel Wireless Bluetooth and then switch the view to Devices by connection, I see the following: If you switch to Devices by connection, you'll most likely see that unknown device beneath the USB Extensible Host Controller. Right-click the Host Controller & unistall. Redetection/reinstallation should be immediate. Sometimes, clearing things out "upstream" and forcing redectection of everything below sorts things out.