My iPhone 6s won’t install the latest update
iPhone 6s won’t update latest iOS
iPhone 6s, iOS 12
If it says that iOS 12.5.5 is up to date, you don't have a 6s, you have a 6.
The 6 and 6 Plus are not compatible with anything higher than 12.5.5.
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My iPhone 6s won’t install the latest update