Download iREB R4 for iOS 4.3 & iOS 4.3.1 to Fix All 16xx iTunes Errors
Restoring iOS 4.3 or iOS 4.3.1 custom IPSW without pwning your iBoot will always result in 1600, 1601 or 1604 error. To restore custom IPSW made with PwnageTool or Sn0wbreeze, you must use iH8sn0w's iREB tool to patch the iBoot of your iDevice with ......