Motor 5 and 6 will not arm.

Hey everyone. I know this had to be answered some where before. I have looked and really never found a fix.  So here goes. 

APM 2.8 

Latest firmware installed

DJI F550 Clone

Flysky 6 channel Radio

4S 400MAH

920KV Motors

SIM 2-4S ESC Red Label

Did all ESC cal

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