Thunderbolt Downstream Camera no longer connecting after April 2022
We use cameras attached to computers to collect images using downloaded software. The cameras have a IEEE 1394b 9pin Firewire port on the back, but we’ve been able to use a Thunderbolt 3 to Thunderbolt 2 adapter and a Thunderbolt 2 to Firewire adapter to connect the camera to a Thunderbolt enabled USB-C port on computers. We used the setup 4/1/2022 to take images and have not used it since 4/27/2022, which is when we noticed the issue. When the device is plugged in, we get the message “Thunderbolt device functionality might be limited”. I tried following older threads to get the legacy drivers reinstalled, but the issue has impacted all of our computers/laptops that used to function, and installing the firewire drivers, thunderbolt controllers, and resetting the start value in regedit has not helped. In device manager, I can see the Thunderbolt 3 to Thunderbolt 2 adapter, but the IEEE 1394 bus does not open. If anyone can help try to get the connection back, please let me know.
P.S.- We are running Dell Optiplex Towers and Latitude Laptops. Also, we are using Windows 10 Enterprise, version 21H2, pack 120.2212.4170.0