I have the actual 250 MB file on my computer, but when I open it up with iTunes, nothing happens. How do I actually install this 3.0 software on the iPhone?When I open up iTunes, it tells me that I have a new update, 2.2.1 (I never upgraded to this, I still have 2.2). Do I have to upgrade to 2.2.1 before the screen will show up with 3.0?