Hi. Just had a similar problem with CC3D (banggood equivalent) and FS-IA6B using PWM. We got past the basic wizard but couldn't get transmitter setup to work. When we moved the throttle stick it couldn't tell.
We unplugged all the outputs from the receiver to see if any of them got a signal when we moved the control levers. We did this by powering the receiver, and then plugging a servo into each pin in turn to check for an output for example when the throttle was moved.
We found the order of the cables was wrong. When for example we moved the throttle it didn't power the right set of pins. We think we've now got this working with red/white/black on Ch3 and the order for ours is black, yellow, green, white/red/black, yellow, blue. Similar order to before but with white/red/black in the middle not at the end. Just putting the rest of it together to test it now....