Mmm V2 Up In Smoke !!!

[BrianG]

Dunno about paragraph 1, but your "update" sounds like the BEC in the MMM is toast and the only way it will work is to externally back-feed 6v into the MMM. When you do this, does the rx pack/regulator get hot, and/or does the BEC circuit on the MMM get hot (you'll have to take it out of the case)? Depending on the MMM BEC circuit design, putting a voltage into its output can cause lots of heat. To me it sounds like your MMM evolved into a form of Opto-ESC.

I would send it back since that is obviously not how it is supposed to work. Good luck and let us know how it turns out.