How to update iPhone 7 to latest iOS version?
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[Re-Titled by Moderator]
iPhone 7, iOS 14
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You can update your iPhone to iOS 15, go to: Settings -> General -> Software Update.
See this Apple article: If your iPhone, iPad or iPod touch won’t update
https://support.apple.com/en-us/HT201435
Or update via PC, see this Apple article: Update software on iPhone, iPad or iPod touch in iTunes on PC
https://support.apple.com/en-gb/guide/itunes/itns3235/windows
If you have a Mac see this Apple article: Update your iPhone, iPad, or iPod touch with the Finder