"Hello all,I took the problem the other way. I asked EMAX why it doesn't work. I wrote them an email and here is their answer:"The current 4 in 1 ESC 25A doesn't support Pixhawk, we had noticed that and are currently modifying the firmware and doing…"
It now obvious that there is a problem on with this Emax 4 in 1 ESC. It seems that it does not work with the Pixhawk. Plenty of people are having this problem.
I am trying to consolidate all the information I found on this problem.