How-to Fix An unknown error (1600)

Also read: Top 10 Must Have Cydia Tweaks for iPhone, iPad, iPod touch

How-to Fix An Unknown Error (1600) while restoring iPhone custom firmware iOS 4.2.1.

The iPhone “iPhone” could not be restored. An unknown error occurred (1600).

Fix 1600 Unknown Error by following these steps:

1. Download iReb latest version
2. Run iReb
3. iReb will kill (close) iTunes software and guide you how-to enter DFU mode.
4. Follow the guide to enter DFU mode.
   If your device was already in DFU mode, you don’t need to do anything, because iReb will be searching for DFUof any connected device.When the device found in DFU mode, iReb will automatically start exploiting the iPhone and let you to restore custom firmware.
5. Once done, Your device is now in a PWNED DFU mode state (black screen).
6. Do not click OK until you have finished restore the custom firmware.
7. You may now launch iTunes and do SHIFT + Restore, to restorethe custom firmware.
8. Done. The custom firmware has been installed on your device. You may either setup as new phone or restore from previous backup. You can close iReb when the firmware has been installed.

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