I am new to this group
I was using Ardupilot1.4 board for my Quad and it was flying well. Recently I made some modification in frame and reprogrammed the board with Mission Planner 1.2.67 Version. Caliberation of accelerometer and Radio done. But I was unable to arm the board after that.No changes made in electronics.Earlier I was using MP Version 1.12.32.
Can anybody help me solving this arming problem?