Originally Posted by gigaplex

SUB-T is sub trim (neutral point), not EPA. Sounds like your ESC calibration is way out.

SUB-T should be 0. EPA-H should be 100%. EPA-B should be 100%. RATE-B should also be 100%. Then calibrate the ESC. I'm guessing your receiver is connecting just fine and it's your ESC that's refusing to arm because it's failing to find a neutral signal due to an incorrect calibration.