[pasan]

You should Contact CC and tell them what happened. They'll be able to advice you further, whether to attempt to power up the MM again (batteries the right way around) or to send it in. I did the same thing to my MMM on 6S once but the resulting spark stopped me in my tracks before any further damage was done. I thought I had fried my MMM, so I attempted to use Castle Link, and it worked like it always had. I re-installed the F/W (reverted to 1.19 and then installed 1.20 again), both times it was successful. I configured all the settings at their lowest,and plugged in a 6 cell NiMh, it booted up fine, tones and all, BEC was working, but I didn't try to drive it because the pack can't handle the motor and gearing setup. Then I hooked up the 6S packs, and its none the worse for wear, except for the scarred connector. I didn't change it out though, I cleaned and dremel'd it thoroughly but wanted to keep it as a reminder of my stupidity and how I should keep my wits about me when dealing with sensitive equipment.