[What's_nitro?]

That ESC isn't opto, is it? Pulling the red servo wire shouldn't have any effect on the programmability. But, just in case, try to program it while using the BEC to power the Rx. The Tx/Rx sync and ESC setup are seperate programming functions. You should be able to sync to different radios regardless of the "programmed" ESC settings. Are the trims set to zero? Is the channel reversed? Is your current radio compatible with the ESC? I'm just brainstorming, I have no idea why a radio wouldn't be compatible. Do you get any of the "beeping" (not to be confused with *beep*ing) error messages? Will it run at all if you just turn it on?

I hope I got you thinking. I hate seeing so many people having problems with the MGM stuff because they truly are great controllers. Good luck!