I want to update my iPhone 6s to iOS 15

Hello,

There are different ways to ensure the highest iOS that your device will support is installed on your device.

This support article has instructions about updating an iPhone or iPad wirelessly --> Update your iPhone or iPad - Apple Support

You can also use Mac and PC computers to update system software:

Update iOS on iPhone - Apple Support

When updating, your device will update to the highest version currently available that it will support, or it will just say it is up to date (and can't go any higher) and won't install anything. Apple indicates ( Unable to update my iPhone 6 Plus from 12… - Apple Community ) I need to point out the obvious and state that if you want to run a higher system version than your current device will run, that you need to buy a newer device.

- An iPhone 6S through 7, or SE(gen. 1), can update to iOS 15.7.5

zehrakhan Said:

"I want to update my iPhone 6s to iOS 15"

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Updating an iPhone 6s to iOS 15:

For Note: Only the latest-compatible iOS version would install.

Update Using a Computer:

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:

Use my User Tip::  Update your iPhone Using a Computer - User Tip