How to downgrade from iOS 4.3 to 4.2.1 (And bypass any unwanted iTunes errors)

Scott Herder 2011/03/16 1
Have you either been duped into upgrading your iDevice to iOS 4.3 by iTunes? Or just wanted to give it a shot thinking downgrading would be smooth and painless. Well so did we.

What a mistake that was. We encountered so many errors (1600, 1, 1013) at Let’s Keep it Simple that it drove us crazy. So we’re making a couple simple video’s to make this problem easier for you.

We will be showing you how to bypass any iTunes error 1600 on a Mac, this will even work for windows users but they already have ih8sn0w’s iReb so it’s kind of pointless but hey.

Click on the iTunes error you got to see a tutorial on how to fix it!

iTunes Error 1013 when downgrading from from iOS 4.3

iTunes Error 1013 any other time!

iTunes Error 1600 – Video & text guide coming asap

iTunes Error 1

To do this all you will need is the latest version of Greenpois0n and the ipsw for your device, and in case iTunes freezes during the restore process you’ll also want RecBoot.



    If itune error(1) happened during restoring 4.2.1, please check with tinyumbrella that your iphone ios already 4,2,1, then re-jaibreak using greenpois0n, it work for me, hope it work for you, speacially with baseband 1.59.00, then reload cydia and run ultrasn0w to unlock your iphone. Greenpois0n only work with 4.2.1 if I am not mistaken.