On my transmitter the instructions tell me to quickly switch the control switch from ATTI mode to GPS ATTI for 6-10 times. There are  ATTI positions: middle and bottom. So I quickly switched from top GPS to bottom ATTI and the LED turned yellow. When I rotated the craft repeatedly horizontal, 360 degrees, the light never went to green - stayed yellow, so I couldn't go beyond that point. Also, the instructions for fitting the propellers are confusing. The schematic shows separate nuts from the propellers, but on mine, they're fixed black or white, into the plastic. It tells me to make sure the rotary mark on the propeller is the same as the mark on the frame arm... but there are TWO arrows on the propeller... going in opposite directions: one with a lock icon and one with the lock open. I assummed the lock icon means it's the way to get the propeller ONTO the screw. So, I did that and it seemed to work. I assume the opposite arrow is to match the motion of the motors, which it does after I secured the propellers. Did I do it right?