Currently on 5.0.1 I been having issues with my phone so I decided to do a restore (5.0.1). I HAVE MY SHSH BLOBS SAVED and have a custom IPSW . I put it into DFU Mode then restore through Itunes Holding shift and selecting my Signed IPSW. It starts but then it just gets stuck on Preparing iphone for Restore until i get error 1604. I tried many times and even used Ireb but no luck. With no other options I decided to use my SHSH blobs for 4.2.1 and it worked just fine and now Im restored to 4.2.1 but I really like to go back to 5.0.1. Can anybody help???