1. IOS 15.5

    If you have an iPhone 6s, iOS 15.5 is the latest version of iOS you’ll be able to download and install. The iPhone 6s, 6s Plus, and all later models up through iPhone 13 Pro Max are compatible with iOS 15.5.
    www.wikihow.com/Update-Your-iPhone-6s-to-iOS-15
    www.wikihow.com/Update-Your-iPhone-6s-to-iOS-15
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