People correct me if I'm wrong, but there are 2 versions of 4 series firmware. The 4.0 and 4.0.1? Is there any difference between them? I got 4.0 and jailbroke it yesterday but when I turn it on and it shows the apple logo it then has colored streaks at the top and a loading circle on the logo is anybody else getting this? Also is the 4.0.1 better for battery life?