I have an iPhone 4 that was 5.1 and jailbroken with redsn0w and my problem is that when I tried to Update to 5.1.1 it wouldn't let me came out with error 1602 and so I then tried to turn the iphone on but when i turn it on the apple logo comes up then the screen turns sort of green and I once seen it go blue I tried restoring but always comes out with errors the last error i had was error 21...