I didn't update the iOS on this phone
How to update iOS on iPhone 5s?
iPhone 5, iOS 10
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You can’t update a 9 year old iPhone 5S hardware higher than 12.5.5. Go to Settings/General/About and see what your model name is; I suspect you have an iPhone 5, not a 5S. If it is a 5S go to Settings/General/Software Update and follow the instructions.