I have 2 copters, a small hex and a big quad. Both are running 3.2.1.
The small hex starts autotune instantly, despite having pretty bad vibrations, no issues there, and this tells me I am a) doing it right and b) my transmitter is set up correctly.
On the big copter, as soon as I try to run autotune, it does.. nothing. Entry in the Logs is "Err: Autotune-2" every time I try to activate it. Yesterday, I actually got it to work by resetting PIDs to default. Today, I switched to 12" propellers and tried to run autotune.. again, Autotune-2, not even trying to run autotune.
No other errors that could cause this. Also, at this time, it's hovering perfectly fine in place, no twitching or anything that could be at fault. I also tried to send the flight mode change over Tower for Android, with the same effect.
Any ideas? I'm tearing my hair out over this.
I attached my log. The GCS errors are due to the fact that I had my cellphone with the radio in my jacket, merely using it for announcements.