Having a little technical challenge, and would love some insight. This is with an older CS 8, MK stack. Running Kopter Tool 2.0, FC 2.0, Navi 2.0. Just updated all firmware and KT, and set new model in Spectrum DX 8. Radio is bound, gyros leveled, compass calibrated, motor test is fine, NO errors in Kopter Tool, telemetry working, gps working. Gyro calibration works (up and left: beep, beep, beep), but motors won't start. Occasionally with throttle down and right, it beeps like it wants to fire, but doesn't beep every time. We're missing something small, but critical. Any thoughts? Many thanks!