PX4 and HEQ firmware

I have a question on if anyone happens to have a copy of the firmware for a HEQ Voyager. Their is a problem with the flight controller not working with QGC and thou I tried working with the company, they have not provided any solutions or firmware for me to try to re-flash the FC. I suggested sending the FC back to them to check for themselves, they are going out of the way to avoid me sending the card back to them. The FC is a PX4FMU V2, Version: 5, Board ID: 255, Flash size: 2080768 per both QGC and Mission Planner, but since this FC seems to be a few years old, due to the size of the flash limitations, nothing seems to install properly. If there is no solution out there, I will more than likely gut the airframe and install a PIXHawk control and 4in1 ESC.