Arming Problem with Ardupilot Mega1.4

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? 

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  • i'm not familiar with the mega 1.4 this group is for the legacy board that doesn't support multirotors

    I also have a apm2.5 and with it you should have a gps lock before arming

    also your trims (end points)need to be correct for the arm to work right

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