MM firmware question

[speed demon]

I bought a new MM and it had 3.05version programed. I ran it with a 3S and mega motor and everything went great. I sent the MM off to get some mods done. Got it back and put a 4S to it and ran fine for a couple of days and now it's acting up with alot of cogging and if I go past half throttle it just stalls. The motor is getting too hot fast. I figured it might be the connectors so I just took them off a soldered them direct and no difference. I got back home and noticed I'm on 1.17version. I tried deleting the program and reinstalling it with no luck. I just can't seem to the newer 3.05 into my MM. What am I doing wrong? Thanks