I purchased a used unit and it powers up and I was able to update the software from 1.6 to 2.6. I notice on power up that there are no temp readings nor does it see the connected GPS unit. I have an IGyro in another airplane and went through set up and configured the one I bought to all the same settings since it is on the same radio. When I go through the setup and get to FMode, it stops and won't go past that screen. When I move the FM switch to positions 1 2 3 nothing changes on the screen. It is on an SBus system and wired exactly the same as my SF260 where that unit is working. So what am I missing or did I waste my money on a bad unit?