How do iOS 13 on a iPhone 6s Plus
How do I get iOS 13 on my iPhone 6s Plus
iPhone 6 Plus, iOS 12
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You ask about updating an iPhone 6s Plus, but your profile shows an iPhone 6 Plus. If your device is not showing the update, or says your device is up to date, then I would say the profile is correct and you have an iPhone 6 Plus which will not support iOS 13.