Cannot arm Arducopter 3 on APM2.52. V2.8 hadn't that problem. Pre-arm check disabled.

Hello there)

I've recently changed firmware v2.8 to 3.1.2, calibrated radio and accelerometer, and APM is not arming anymore. I also change ESC's to HK's Simonk, but everything else, including radio and its settings stay same. Red flashes withsingle interval and nothing changes wit stick down-right.

The board probably has crappy compass(it sends no data when enabled) but I've disabled it and this had no effect on arming APM with previous firmware.

I also know that some sort of bad TX shamanism has been required to arm early APM versions. Unfortunately, I can't remember it, and in addition to main question would be thankful if someone helped me to recall.

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Well, just have armed successfully with an early version hex of May 2013. Current is still unarmable.

Now arming ok on 3.1.2 too, after reflashing back again. Still don't know what has this been. Maybe the wrong flight mode? I believe I checked it at the first time...

Im having the same problem.  Cant arm with the new software.  What did you do to resolve

Just reflashed. Than checked current flight mode and disabled pre-arm check.

I had a problem arming and what I found was the rtl switch was on and when I tuned it off it still would not arm. I had to switch from stabilize to alt hold and back to stabilize.

Same here I updated firmware from 3.01 to 3.1.2 and my failsafe throttle value was blocking my arming. Reverted back to 3.01 and its arms fine. There must be a bug in 3.1.2 for some 2.5apm boards. 

Thanks for that info Michael.  How do I revert back to 3.01?

In your Mission Planner, Initial Setup tab, then select install firmware, All the aircrafts will show on screen, look on the bottom right you can pick previous firmware.

I recommend checking the advanced parameters, compass mott offsets and making sure none of them have non-numerical "nan" values in there.  I had the same problem after I udpated firmware and ran compassmot, somehow it messed up and put a couple of "nan" in the compasmott offset parameters that should be numerical numbers.   With the "nans" in there it caused my compass and horizon to drift erratically and I was unable to arm. 

Edit: this was with a pixhawk though so not sure if it would apply to an APM, but its a quick thing to check. 

MP cannot load previous firmware list. I don't know if this happen because firmware generator site is not working, or there's a MP bug. So one can go directly to http://firmware.diydrones.com/Copter/ , download appropriate .hex and open it in MissionPlanner.

Glad that you've solved the problem. I have ran into similar problem (Arducopter 3.0.1)

My problem solved when I execute the last troubleshooting step in the wiki at https://code.google.com/p/arducopter/wiki/AC2_Troubleshooting#I_can...

11. If all that doesn't work, you may be stuck in a "calibration loop" (a failed calibration left the calibration flag set in the APM EEPROM). Go into the CLI (MP Terminal Tab) and do a Setup/Erase (this will clear your EEPROM) and then reload your ArduCopter firmware via the MP and try the RC calibration again.

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