How do update my iPhone 6s Plus to the latest iOS
How do update my iPhone 6s Plus to a better iOS
iPhone 6 Plus, iOS 11
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Your post tells us that you have an iPhone 6 Plus, while your message mentions an iPhone 6s Plus. Big Difference.
If you have an iPhone 6 Plus, that model can only be updated only as far as iOS 12.5.5. Chances are, you are already there. No more updates will be available for that model.
If you have an iPhone 6s Plus, that model can be updated to iOS 15.6.
So, the big question here........what model of iPhone do you have? Not sure?
Check Settings > General > About > Model Name
If your iPhone is qualified, you can update your iPhone by following the instructions in this Apple Support document:
Update your iPhone, iPad, or iPod touch - Apple Support
