dei

I had a Z1 put in my truck a couple months ago. The other day I was doing working on the stereo system and noticed the manufacturing date listed on the box was Oct 2006, but the manufacturing date listed on the unit was May 2006. I didn't remember to check the serial numbers before I closed it all up though. Is this common or did I get screwed by the place I bought it/had it installed? What would a reason be for this?

I saw a thread about MP vs v1.2...but what is the difference between 60MT and 60MP? 60MP seems to be the one offered on pioneers website, but I don't know what 60MT is. I did the solder two points bypass on my N2, I currently have 50mt-v1.0... upgrading the firmware shouldn't be a problem, right?