"Thunderbolt(TM) Controller -1577" appeared under the 1st of the four PCI-toPCI Bridges (the USB 3.1 XHCI is under the 3rd) but it's only visible when "Show hidden devices" is selected. If I double click it, it says the hardware device is not connected (Code 45). I don't know if that's normal. Maybe the firmware was not updated properly? Running the firmware updater again just tells me to shutdown, unplug power and restart.