"So, after writing the reply a new version of ArduCopter (3.1) came out so I checked the changes and there was a fix to it. So it was a problem of the ArduCopter software."

"Well, I figured it out after the whole day testing why I couldn't connect to my APM. I just found it when I was searching the solution. Is anyone there who found the solution? I would like to use my quadcopter also inside the buildings so I need the…"