WIN10 After upgrade Bluetooth is gone, Device Manager does not have, more than a serial controller unknown USB device?

Win10 after the update, Bluetooth function is gone, there is no option to open the Device Manager, there is an unknown USB device, reboot invalid, reload Bluetooth driver is invalid, Bluetooth in the BIOS is open.

Try to find all the methods on the Internet, including Update WIN10 update, update Bluetooth driver, etc. are not resolved,

Solutions are:

1. Open the Device Manager, uninstall the unknown USB device, and re-identify the hardware. The problem is solved.

Sometimes can recognize Bluetooth, sometimes do not recognize, usually more than a few times, or after a period of time to identify, can be identified.

WIN10 After upgrade Bluetooth is gone, Device Manager does not have, more than a serial controller unknown USB device?