@Alvin I had the system powered from a bench top regulated 3A power supply for all testing. The unit was fully function prior to the ground unit update to solex, the led with usb alone does nothing, with power applied it stays off a few seconds then led2 turns yellow. When booting with the reset button pressed per Ian’s suggestion no change occurs however if I continue to hold the button pressed for 5 seconds after power, the yellow light takes a full minute before it turns on. The flasher app on win10 and ubuntu never sees the air unit. While I truly hope I am simply doing something wrong, the fact is that neither linux or windows acknowledge a device on the USB port and that leads me to believe the problem is hardware. The system was tested before attempting the update, it paired, sent SBUS, and returned video but I never bothered to check the USB port. After updating the ground unit I have firmware I can’t regress and an air unit i can’t upgrade to a matching version, however even with the mismatch it does still appear to “pair” but the system is not fully functional. IF allowed, I will happily open the unit up and take a peek, I have an oven and hot air capabilities if the issue is obvious.