Prepare Your iPhone 4s for iOS 9.0.1
If you install the iOS 9.0.1 update on your iPhone 4s, you put your device's performance at risk. And while there is no real way to guarantee your device's safety, you can do some things to help lower the odds of running into iOS 9 problems.
Do a little prep work before installing. We've put together a short list of things to do before installing the iOS 9.0.1 update. If you're new to iOS or you're feeling leery, take a look at those. They will help.
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