Hello there)
I've recently changed firmware v2.8 to 3.1.2, calibrated radio and accelerometer, and APM is not arming anymore. I also change ESC's to HK's Simonk, but everything else, including radio and its settings stay same. Red flashes withsingle interval and nothing changes wit stick down-right.
The board probably has crappy compass(it sends no data when enabled) but I've disabled it and this had no effect on arming APM with previous firmware.
I also know that some sort of bad TX shamanism has been required to arm early APM versions. Unfortunately, I can't remember it, and in addition to main question would be thankful if someone helped me to recall.
Replies
Well, just have armed successfully with an early version hex of May 2013. Current is still unarmable.
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