Orion Starshoot Autoguider VID PID Override - OpenPHDGuiding/phd2 GitHub Wiki
Apparently some SSAG cameras are susceptible to firmware corruption that causes them to report spurious USB VID/PID values making them show up as an unrecognized USB device. More info: https://groups.google.com/d/msg/open-phd-guiding/vuwldbOc9OQ/M34xYtJRAgAJ
If your SSAG has this problem, you can workaround the issue so that PHD2 can still access the camera.
For Windows, see the instructions here: https://www.cloudynights.com/topic/406237-orion-ssag-firmware-reset/
For Mac:
Open System Information, find the camera in the USB devices list, and make note of the Vendor Id (VID) and Product Id (PID) values
Click the camera settings button
Enter the VID / PID values you found in System Information
You can now connect to the camera.