3.1 Trad Heli won't arm in 3dr

Hello! I am having trouble with arming my t-rex 600 whenever I use the 3.1 and 3.1.1 firmware. I get a notice in the hud near the disarm status something like "Prearm ins not healthy" for 3.1 and "Prearm Alt disparity" for 3.1.1.

I am using an arduino mega 2.5 board.

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