Hi everyone, I'm having a big problem with my iphone. I was on 5.1.1 and decided to downgrade to 4.2.3. I used Redsn0w to downgrade. The problem is that after jailbreaking, when it was still in the end of the jailbreaking procees, I noticed a white screen for a few seconds, then It shuted off and now I can't do anything with it, It doesn't turn on, Itunes does not recognize, holding the home + power buttons does not work , can't get into dfu mode, I tried everything, it does not charge on the wall adapter either. Can someone give me some advice?