ASUS ROG STRIX B450-E GAMING - No bluetooth after firmware upgrade

I upgraded the firmware(bios/UEFI) of my motherboard, the ASUS ROG STRIX B450-E GAMING, and after that the bluetooth adapter was not available in both Windows and Linux. I spent several hours debugging, but after i dropped into a Reddit thread concerning another ASUS motherboard, I found the solution.

I had to shutdown the computer, and pull out the power cord. After waiting 5 minutes, I put it back in and booted the computer.

Bluetooth was back…

WHO KNEW “Have you tried turning it off and on again?” would actually be the answer?!?!

PS: I assume the cord pulling and waiting is the important part, making sure the system is completely without power.