Fix iTunes Error 1604,1603, 1602, 1601, 1600, 29 During Custom IPSW Restore iPhone 4, iPhone 3GS, iPhone 3G, iPhone 2G, iPad 2, iPad, iPod Touch 4, iPod Touch 3, iPod Touch

1. Use a small utility iREB (iTunes Restore Errors Bypasser) by ih8sn0w to basspass iTunes errors. Download iREB for Windows or Mac (coming soon).
2. Now put your iDevice in DFU mode by following procedure here
3. Start iREB and select your device on iREB interface below,
   
4. Now open iTunes and shift+restore your firmware  and your 16xx, 29 errors are removed.

Error discription in Apple support is as fol,

Error 1600, 1601: Uninstall and reinstall the latest version of iTunes (see instructions for Mac and Windows). If that doesn’t resolve the issue, see the steps for 1602.

Error 1602: Try the following steps to resolve this error:

1. Ensure proper USB isolation troubleshooting has been performed, and test with a known-good cable.
2. Follow the steps listed for Error 1604.
3. This error may be resolved by disabling, deactivating, or uninstalling third-party security, antivirus, and firewall software. See steps in this article for details on troubleshooting security software.

Error 1603: If you receive this error and the iOS device is not automatically placed into recovery mode, it may be necessary to do so manually. Refer to iPhone and iPod touch: Unable to restore for steps on placing iPhone into forced recovery mode. Also, remove the IPSW and attempt to restore again. If you do not want to remove the IPSW in the original user, try restoring in a new administrator user.

Error 1604: This error is often related to USB timing. Try changing USB ports, uninstalling and reinstalling USB ports, and other available USB troubleshooting steps (troubleshooting USB connections, device not recognized properly, computer won’t recognize a FireWire or USB device). If you are using a dock, bypass it and connect directly to the white Apple USB dock connector cable. If the issue persists on a known-good computer, the device may need service.