Prepare Before You Upgrade
Upgrading to the new version of iOS is fairly straightforward, but if you want to avoid installation problems and be prepared in case anything does go wrong we suggest you prepare before you upgrade.
Use this guide to see what steps to take before you install the iPhone 6s Plus or iPhone 6 Plus iOS 9.1 update on your iPhone. This is helpful for users upgrading from iOS 9.0.2 and also very important for users on an older version.
iPhone 6 Plus users who are still on iOS 8 should pay particular attention to the steps.
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