can iPhone 5s be updated to iOS 14, iOS 15 or iOS
can iPhone 5s be updated to iOS 14, iOS 15 or iOS16
iPhone 5s, iOS 12
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An iPhone 5s will only update to iOS 12.5.7
This support article has instructions about updating an iPhone or iPad wirelessly --> Update your iPhone or iPad - Apple Support
You can also use Mac and PC computers to update system software: Update iOS on iPhone - Apple Support
When updating, your device will update to the highest version currently available that it will support, or it will just say it is up to date and won't install anything. Apple indicates ( Unable to update my iPhone 6 Plus from 12… - Apple Community ) I need to point out the obvious and state that if you want to run a higher system version than your current device will run, that you need to buy a newer device.