How to Fix 1604, 1601, 1600, 16xx Error During iOS 4.2.1 Custom IPSW Firmware Restore in iTunes with iREB RC3
iPhone developer iH8sn0w has just released a new version of iREB which is compatible with all iOS 4.2.1 devices. You can use it to bypass 1604, 1603, 1602, 1601, 1600 error in iTunes during custom iOS 4.2.1 firmware restore which has been created using either Sn0wbreeze or PwnageTool.
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