Trust me,It's in the blades,been there done that.While the blade are on the heli, pinch the end of the top blade between your right fingers and the left blade between your left two finger and twist them so the cup side is going under for 60 seconds.do the bottom blade the same was.Thats what I had to do after tech sipport had me but a new 4 in 1 controller and that wasnt the problem.