"My problem is solved by uploading 3.2.1 firmware by choosing custom firmware feature. Latest MP will not allow down rev installations. although it has features that should support (Bug?)

Thanks you to the DIY community  :) "

"Yes, the battery voltage was set for 4-cell and I was testing it with 3-cell. Once I switched to 3-cell (10.5 V), it flew fine.
I guess APM was behaving correctly by landing the copter after low voltage.

Thanks
Riz"

"Omar, No JP1 jumper is installed. Can you please review the failesafe screen captures attached. In this manu the PWM values are not changing when the thr stick is moved. They only change when selecting different modes.FailSafe Mode screen…"

"Tbone,
I selected 3.2.1 and the message came up telling me its no longer supported and it will load the latest firmware.
But the quad symbal displayed 3.2.1. 
Is there somewhere I can confirm whats got loaded on the apm?
After flashing with 3.2.1, I…"

"sorry I miss wrote about JP1 jumper. It is not installed.
In the fail safe mode all channels correspond to radio inputs correctly.
Would it be possible to compare your "Full Parameter List"? I have seen Dave on youtube upload his parameters on a APM…"

"Omar and friends, My quad (F450) flips over during takeoff just as the article title states...  :(
I have gone thru motor direction check.
Prop check
mag and compass calibrations
Radio cal
 ESC cals 
apm wiring check, and so on.
I can hold the quad…"