Please how do I update my 7 plus

An iPhone 6s, iPhone 7, or iPhone SE 1 isn't capable of 16 or above; they require an A11 or better CPU. To install 15.7.8, use a computer or the Software Update function in Settings.

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minah32 Said:

"Please how do I update my 7plus"

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Attempt an Update Using a Computer:

Alternatively, you can use Ethernet through a computer.... To avoid this persistent notification on your iPhone, try updating via a computer. If you cannot use Wi-Fi, then use Ethernet.  Go Here: Update your iPhone Using a Computer - User Tip. On the computer, you would connect it through Ethernet, going directly into your router. For a Mac (or PC) that does not have Ethernet, this would be the adapter to use: Belkin USB-C to Gigabit Ethernet Adapter - Apple

Please do not update. You iPhone 7 Plus is worth more on iOS 13, and it will run faster.

It's also a few years behind as far as security.......if you care about things like that. Apple considers iOS 13 obsolete, so no support is offered.

So, you are recommending an iOS version that is long out of date and not supported. Brilliant.