I want update iPhone 7 Plus

Update your iPhone, iPad, or iPod touch

• If you have an iPhone 5S or 6/6plus, the highest you can update to is 12.5.5

• If you have an iPhone 6S through 13, you can update to 15.5

Go to Settings > General > Software Update.

Update your iPhone, iPad, or iPod touch using WiFi -

Update your iPhone, iPad, or iPod touch - Apple Support

Update using your computer -

https://support.apple.com/guide/iphone/update-ios-iph3e504502/ios

Hello,

Go to Setting > General > Tap Software Update .

• Make sure iPhone have Enough Storage for update at least 6GB.
• fast Wifi Network with Internet access (no cellular data, unless you use a 5G network, no personal hotspot on your device, no VPN connections are admitted, no Low Power Mode enabled
• you cannot update over cellular data or a cellular hotspot

Here --> Update your iPhone, iPad or iPod touch

Here --> If your iPhone, iPad, or iPod touch won't update - Apple Support

tra291 Said:

"I want update iPhone 7 Plus: I want us iPhone 7 Plus"

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Updating an iPhone:

What to Update: Installed apps and the iOS.

How to do so...

A. Verify Compatibility:

Identify your iPhone model. The first thing that comes to mind in incompatibility being the culprit. So, confirm the model of your iPhone. If iPhone model is incompatible with iOS15 then it is because you iPhone does not meet the hardware requirements for this iOS version(s).

B. If Compatible...

1. Back Up First:

IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update

then...

2. Proceed with the Update:

Go Here:  Update your iPhone Using a Computer - Apple Support