I upgraded my work laptop lenovo T540P from Windows 8.1 to Windows 10. There were some issues like DisplayLink not working or a BSOD in Synatpics Touchpad driver which were all resolved by using the lenovo System Update to update the drivers.
But I have completely lost Bluetooth and the System Update hasn't helped with that. Some observations:
There is no Bluetooth section in Settings/Devices
Device Manager shows an "Unknown Device" under Other Devices, which has the error "The drivers for this device are not installed. (Code 28)". There is no Bluetooth device anywhere in device manager
Every run of Lenovo System Update prompts for installing "Intel Bluetooth Device Software - Initial Install - 10", even after installing it
Installing Bluetooth drivers downloaded from Lenovo, outside the System Update tool didn't help either
Lenovo Enterprise Support recommends reverting to Windows 8.1
If I buy an external Bluetooth dongle, will it be recognized or can I expect to have similar issues with it as well?