Download Standalone Version Of iReb whichbrings fixes for iOS 6 restores errors. iReb is a software application by iH8Sn0w for iOS users to fixes iTunes errors like 1600, 1601, 1602, 1603, and 1604 while trying to restore custom firmwares created by jailbreak programs like Redsn0w or Sn0wBreeze by placing your iOS device into a pwned state. iReb’s has also functionality to fix Recovery Mode loops on iPhone.
For the time being iReb only supports iO6 restore on only A4 iDevices. User can download iReb for iOS 6 restores from below posted link.