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I still have my old iPhone 3gs (AT&T) with iOS 6. I have a back up of it as well. I also have a iPhone 4s (Sprint) with iOS 7.

Can I grab the ipsw file off my iPhone 3gs and install it on my iPhone 4s?

I will not install any ipsw from the net. It is not worth the risk of getting an infected or spyware file.

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  • Welcome to Ask Different! If one of the answers posted here answers your question, please accept it by clicking the checkbox next to it. Thanks! Commented Mar 14, 2014 at 21:26

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No, even if you obtained the IPSW, it would not install since there are different IPSWs for different devices.

You can check the authenticity of an IPSW per this question:

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Here is a reputable website that gives a lot of information about each IPSW, and it gives you the direct link to the file on Apple's servers for each one. Famous jailbreakers @icj_ and @iH8sn0w run the website.

http://www.icj.me/ios/all

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  • Thank You. I am reluctant to use any file not from apple itself.
    – Rich
    Commented Mar 14, 2014 at 2:49

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