How to calibrate ESC's using Devo 7 tx/rx

Many FC configuration's suggest that ESC's need to be calibrated yet using an ardupilot 2.5 mega FC I can't do it via software like I can on openpilot cc.Problem is my Devo 7 tx requires me to put the throttle control at zero position before it starts to work when I first connect to the rx on the quad.So, I turn on tx, then the rx on multi wait about 5seconds when the link and then rx/tx are linked.There is no way to start the multi sequence with the throttle all the way up so the ESC'think they are getting programmed.I do not find a means to turn this "safety feature" off on the Devo tx.Any suggestionsRolf

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