I am new to this group. I was using Ardupilot Mega 1.4 for my Quad and it was working reasonably well. I made some frame modification and programmed the board with APM Planner 1.2.67. Then the accelerometer caliberation, radio caliberation completed successfully. But when I tried to arm the quad it was not getting armed. I tried almost every thing I know but could not get it armed, some thing is going wrong.
Can anybody help me?