I have iPhone 4 on 5.0.1 and jailbroken and want to restore it on 5.0.1 as I'm having memory problems. I used iFaith to create a custom IPSW for 5.0.1 as I have the valid blobs for 5.0.1. So then I used iTunes to restore, but it gave me an error 1600, I have no idea why this is happening. I tried creating a custom IPSW using snowbreeze but this time iTunes gave me an error 1604. What do I do?