Hi there, I have a Latitude 7490 that is on the latest BIOS version, and all the updates are applied through SupportAssist except for the Intel Thunderbolt Firmware. Every time I try to update it I get the error "The Intel Thunderbolt Controller Driver needs to be installed or updated before the Thunderbolt firmware can be updated". I have tried it both unplugged from the docking station and plugged into the docking station, and have made sure to enable the Thunderbolt Service in Services so it's running when I apply the update and it has made zero difference. I have tried uninstalling the Controller Driver, restarting, installing it again, restarting, and attempting the firmware update and still get the same error. 

When I start the update, it says my version is 2.0B going to version 46.0. I have tried other firmware updates and didn't have any luck still. Please let me know if the controller is broken or if there's anything else I can try.

Thanks!