How do I update iOS on my iPhone 8 Plus?

To update the iOS of your phone, select Settings > General > Software Update. But it looks like you are already at the highest version, iOS 16.

Update your iPhone or iPad - Apple Support

The iPhone 8 Plus has reached the end-of-life support for Software Updates to the latest iOS operating system.

You are invited to visit an Apple retail store to discuss your iPhone upgrade options.

Learn about the ⇢ iPhone Upgrade Program. ⇠📲

Good luck! 👋🏼😉

mohii18 wrote:

iSO 17

You cannot update an iPhone 8 Plus to iOS 17 or higher. For the iPhone 8 Plus, which originally ran iOS 11, iOS 16 is the end of the line.

How do I update iOS on my iPhone 8 Plus?

You don't, because it is not possible to install iOS 17 (or iOS 18) on an iPhone 8, iPhone 8 Plus or iPhone X.

You need at least an iPhone XR or higher model. An iPhone 15 or iPhone 16 would be recommended.

iOS 17 is no longer available. Install iOS 18.

Probably you are seeking to update iOS because --> New Apps that require higher iOS versions than your device can be updated to... - Apple Community