Guys, I can't seem to calibrate my ESCs as I have several Turnigy, Avionics Captain 45, and Castles. When I plug in an ESC to a fully charged LiPo, I get the beep. But, I can't get into calibration/programming mode with any of them. The steering servo works, but throttle doesn't. I've tried it with several receivers too - same thing. My radio is a Hitec FM Aggressor. I used to be able to do it, but it's been 5 years since I last ran a boat. I was able to calibrate the CC 120, but I couldn't repeat getting into the calibration/programming mode a second time to check.

Any ideas on what it could be and what I should do with the Hitec FM radio?...

Thanks