Downgrade, how so? From all of the Iphone user input and reading i've done on them, Iphone seems unstoppable (80K+ apps, billion? downloads) Everyone i know that owns one praises it's capability and the continual apps developed for it. Some of the apps i have seen are just flat out impressive. One of the latest and greatest i've heard of is one that identifies a song name and artist by just hearing it for a few seconds. Just having it explained to me was mind boggling what the Iphone can do and possibly in the future....

As far as seeing how to unlock that thing, visit a Iphone forum. I'm not gonna lie you may have to do a lot of reading....that's how i learned so much about the MKIV, a dedicated forum to it.