PTZ camera update:
I attempted to contact VHD directly to ask for old v50u firmware. I setup a burner PC on cellular and had a teamviewer session with a VHD-Corp support engineer. They sent over v50u images and was able to flash the images to the camera.
But... The camera/PTZ system still do not respond to IR remote, web interface issued commands, nor is a picture output via HDMI. Flashing the 2015 image resulted in HDMI output of just black rather than no signal at all so that was nice... I am guessing the FPGA image flashed bricked the video subsystem. :(
Shout out to VHD for taking a remote support call for a 10+ year old camera from some internet rando. All it took was giving them teamviewer access to the box. 🌶️