"I know the developers made a security option by let a user to modify values in a "secure" range.
This can be bypassed by using the full parameter list, not extended tuning tab
It's not difficult to do."

"I think you should go to full parameter list and change values there by hand..
pietro"

"Autotune works in altitude hold and you must have the throttle in center position and sticks too..
Control your radio calibration."

"Strange thing as if I remember well if you put a ubec on output it will power the board...
Be aware that its power module output only 5v not 5.2 and sometime I had power warnings in my dataflash logs...
Too low power vcc it could brown out"

"http://copter.ardupilot.com/wiki/flying-arducopter/prearm_safety_ch..."

"Are you sure you disabled prearming checks in mission planner?"

"I think it's useless..
Usually GPS modules have their own leds and if you set prearming check your apm won't arm if it is not in 3d fix below 3m hdop
When it arms motor start to spin slowly, so..."

"I don't look at them :-)
Just power, connect mission planner or 3DR tower on my smartphone to control everithing is ok and then go fly!
I use them just to control some things like the "autotrim" mode enabling.
If you pull the yaw right and throttle…"

"Ok and to see if the mag is working just use a magnet and move it around the GPS. Look at the HUD in Mission Planner to see if your heading changes"

"If I remember well they go near the GPS, i2c slot. Try the 2 different combinations (like tx/rx and rx/tx)"

"Ok thanks leonard"

"With 5v power I went flying for 10 minutes, but it's a risk.."

"Hello
It's not broken..
Simply it doesn't give enough power.. I have another one and asap I'll try with that
Otherwise a bec with attopilot to measure V and A"

"Update
Installed on my diy tricopter it flies really nice!!
All works fine, every calibration and setup was easy as pie.
Just one problem..
The power module, take care of it!
It produces 5,0V on the output VCC (usually it shold be 5,3V) and so apm…"

"Hello
same question here, like Markus one..
Are all the steps still valid for arducopter 3.2.1?
And is it possible to use this guide also for a tricopter frame??
Thanks everybody!"