If you will try to restore iOS 4.3.3 custom IPSW on your iPhone, iPod Touch or iPad without using iREB, iTunes will throw 16xx error. This is because iBoot (Bootloader) of your iDevice is smart enough to differentiate between a stock IPSW and a custom IPSW. When your iBoot sees that you are trying to restore a custom IPSW, it tells iTunes not to restore this firmware on your iDevice. To fix this, you need to patch your iBoot using Geohot's Limera1n exploit.
This guide will teach you how you can put your iDevice into Pwned DFU Mode using iREB RC4 on Windows. If you are a Mac user, follow this guide to use Redsn0w as an iREB alternative on Mac OS X. Once you iDevice is in Pwned DFU Mode, you can restore custom iOS 4.3.3 IPSW through iTunes without getting any 16xx (1600, 1601, 1603 & 1604) error.
- Download iREB RC4 for Windows from here and extract the ZIP file on your desktop.
- Connect your iDevice to your PC via USB cable and launch iREB-r4.exe
- Now use the following instructions to put your iDevice into normal DFU mode:
- Make sure your iDevice is properly connected to your PC and iTunes is not running in background. Turn OFF your iDevice completely by pressing the Power button.
- Press the Home+Power button at the same time for 10 seconds.
- After 10 seconds, release the Power button but keep holding the Home button until iREB detects your iDevice in DFU mode.
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