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How to create a Custom ipsw to downgrade / update / restore / update by preserving your baseband

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For many reasons we need to create a custom ipsw means a custom ios version to update or downgrade or whatever your reason is. This post will easily teach you how to create a custom ipsw in very few easy steps. You can create a custom ipsw using different softwares like – iFaith , redsn0w, sn0wbrezze etc. I will be using iFath & redns0w both  to instruct you on how to build a custom ipsw. 
 
Requirements: 

You must have saved SHSH blobs for the iOS version you want to restore to. Example – iOS 7.0 or 6.1.2 (which are not being signed currently as iOS6.1.2 is out). They are supposed to be locally stored on your computer.
You must have proper IPSW for the desired iOS for your iPhone/iPad/iPod Touch model.
Download iFaith from HERE
Go to C:WindowsSystem32driversetc and open the hosts file with notepad. If any of these lines are there, remove them.

74.208.10.249 gs.apple.com 

 

127.0.0.1 gs.apple.com

 

 
 
Now follow the steps to create an custom ipsw –
Step 1 : Creating Signed IPSW.

There are two methods of creating a Signed IPSW. Using iFaith and using Redsn0w.
Or you can watch the YouTube video bellow to get on screen instructions –

 

 

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How to create a Signed IPSW using iFaith by iH8sn0w : 
Run iFaith.

Click Build *Signed* IPSW w/Blobs button.
Now browse to the saved shsh and select the shsh blob for iOS 5.1.1. If you saved shsh using TinyUmbrella, they are saved in C:UsersUser Name.shsh directory. Blobs saved by iFaith have .ifaith extension while TinyUmbrella saves shsh in .shsh extension. You can use any of these.

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After you select the shsh blob, iFaith will verify it and show you the iOS version and build and ask you to browse to the IPSW of that iOS IPSW file.

Now browse for the stock IPSW. Note that iFaith does not support custom IPSW (redsn0w does).
After selecting the IPSW, it will show credits and is ready to build the signed IPSW for you.
Click Build IPSW button and it will start building signed IPSW.    

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Once iFaith finishes building signed IPSW, it can guide you to enter Pwned DFU mode so you can restore using this signed IPSW. If you want to restore right now, click Proceed button, and follow the instructions to enter Pwned DFU mode. After you enter Pwned DFU mode, you can restore using the signed IPSW.
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Entering Pwned DFU mode.

In order to use the signed IPSW (or any custom IPSW for tha matter), you need to enter Pwned DFU mode. We will use redsn0w here.
Run redsn0w and click Extras. Then click Pwned DFU button.
Now connect your iDevice to your computer and Power it off.
Click Next button and follow steps shown in redsn0w to enter Pwned DFU mode.
Once in Pwned DFU mode, you are ready to restore using signed IPSW.

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Doing a restore.

Open iTunes. It will say it has detected iPhone in Recovery mode. Click OK.
Now press and hold the Shift key on your keyboard and click restore in iTunes. Release Shift and browse to the signed IPSW. If you used iFaith, it will be on your desktop and if you used redsn0w, it will be in the same folder from where you provided the IPSW to redsn0w.
You now have successfully restored your iDevice back to iOS 5.x version from iOS 6 and above. 

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Article Categories:
iOS Help