Please help me setup Heli 450 pixhawk circuit

I setup heli 450 pixhawk circuit but no success there are some bugs
 - RC Walkera Devo 7
 - Pixhawk
 - RS sbus
 - Servo KST

There is an error

 - Can not start motor

 - Servo channel is backward

Link error pitch

https://www.youtube.com/watch?v=xf6Qw3i2JKg

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