How to Fix 1604, 1601, 1600, 16xx Error During iOS 4.1 Custom IPSW Firmware Restore in iTunes with iREB 4.1

New version of iREB for all iOS 4.1 devices is now available for download. You can use it to bypass 1604, 1603, 1602, 1601, 1600 error in iTunes during custom iOS 4.1 firmware restore which has been created using either Sn0wbreeze or PwnageTool.