Some of the most common errors that you may experience while restoring your iPhone, iPad and iPod touch using a custom IPSW are the ever annoying iTunes 16xx errors. This is because your device's iBoot is capable of differentiating a stock IPSW from a custom one. If the iBoot is able to recognize that you are trying to restore to a custom IPSW, there is a good chance that iTunes will return a 16xx error. But of course, we are here to help you out in case you cannot restore iOS 5.1.1 custom IPSW. You will just have to download a tool called iREB to patch your device's iBoot using using Geohot's Limera1n exploit.
This tutorial will help you put your device into Pwned DFU mode using iREB R5 on Windows. Once you are in Pwned DFU mode, you should stop seeing any 16xx (1600, 1601, 1603 & 1604) errors.
Steps on How to Fix All 16xx Errors While Restoring Custom IPSW Using iREB 5.1.1 for iOS 5.1.1:
- Download iREB 5.1.1 for Windows from this link and extract the contents of the file on your desktop.
- Connect your iOS device to your computer via USB cable and launch iREB-r5.exe.
- Now you will have to place your device into DFU mode. Just follow the onscreen instructions that will be provided by iREB or you can follow the instructions below:
- Ensure that your iDevice is properly connected to your PC and iTunes is not running in background. Switch OFF your device 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.
- Once the program detects that your device is in DFU Mode, its iBoot will be patched with the Limera1n exploit. This should take no more than a few seconds.
- Once the process is completed, you should see a confirmation message that your device is now in Pwned DFU state. Now you are ready to restore your device using iTunes.
- Remember not to disconnect your iDevice from the computer. Launch iTunes and select your iDevice from the side panel.
- Hold down the SHIFT key and clicking on the Restore button.
- Browse for the iOS 5.1.1 IPSW file and click Open to commence the restoration process.
And that's it! If you want some help on how to jailbreak iOS 5.1.1 untethered, you can refer to our Absinthe and Sn0wbreeze guides. In case you run into other iTunes errors, check these fixes that we have provided: iTunes error 3194, iTunes error 11 and iPhone Cannot Be Restored error. As you download iREB 5.1.1, hopefully you won't run into any 16xx errors this time.