Hello! I had recently downgraded from 4.0 and when I reboot or turn on my device there's a line on top of the apple logo, I'm sure everyone has this issue. First of all why is this, why do I still have it after downgrading to a completely different firmware I thought it was only with 4.0, and lastly is it harmful to my iPod. Sry for all these questions, any answers would be appreciated!!