Spirit System

I was wondering why my castle arm lock key when pulled out is not arming the
ESC . I have the cable in the Spirit Pro in servo port 0 . I have also tried other
ports and it still dose not work . It is switched in the Castle to Arm Lock . Would it be possible that the Arm Lock and Spirit are not compatible.

Hello,

the Spirit unit at CH0 port has frequency as other cyclic servos. This could be a problem if the Castle Arm Lock can't work at that frequency.
You can try temporarily to decrease the Cyclic servo frequency if it will help.