How to re - install old IOS

I made the mistake of installing the wrong IOS update on my IPhone 4 instead of my IPhone 4 s. Since then I used n and I now want to reinstall the correct IOS on the 4 to give it to my friend, who lost his phone, how do I proceed.

I thank in advance for your help here.

Bob Bruinsma - Postema

You can not downgrade the iOS version you are running. The iPhone 4 can not run anything superior to iOS 7.1.2. If you have installed something more than that, then it is not a 4, it's a 4 s.

Tags: iPhone

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