I remember when I had a 3.1.1 jailbroken iPod and i just clicked update and it went to 3.1.2. I didn't have to restore anything. All of my apps and music were still there. Now why would I have to DFU restore to get to iOS4?? When I can just click update and not lose anything and waste time resyncing and stuff? The tutorial says DFU restore. Why can't I just click update on untethered 3.1.3??