Some systems and firmware revisions don't show the controller firmware version unless the controller is active, and that can only be achieved with an actual Thunderbolt device. A USB-C to DisplayPort adapter/cable is a regular USB device. However, even if you can't check the current firmware version, you should still be able to install a firmware update -- and after that you may find that your system always reports the version. Make sure you update your system BIOS and Thunderbolt drivers/software before you attempt the firmware update.
If you open the Thunderbolt software from the apps listing, you should get a Thunderbolt icon in the Task bar hidden icons. Right click that and select settings.. Use the Details button...
jphughan
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Posted January 14th, 2019 13:00
Some systems and firmware revisions don't show the controller firmware version unless the controller is active, and that can only be achieved with an actual Thunderbolt device. A USB-C to DisplayPort adapter/cable is a regular USB device. However, even if you can't check the current firmware version, you should still be able to install a firmware update -- and after that you may find that your system always reports the version. Make sure you update your system BIOS and Thunderbolt drivers/software before you attempt the firmware update.