I too am having this issue. I plug it in the the USB 3.0 port (confirmed working with other devices), it says thanks and starts trying to update the firmware. After a minute it stops, and nothing happens. No connection, no lights, not able to find anything.
Most unsettling is the fact that the Tobii Eye X isn’t in the device manager, but the Bootloader is. Should I assume that the firmware failed and my eyex is bricked?