[kstrauser]

You're right, according to https://www.apple.com/os/ios/ .

[system2]

Well, mine doesn't go above iOS 17. I triple checked it now.

[kstrauser]

It does: https://support.apple.com/guide/iphone/iphone-models-compati...

You might need to download an image and install it via a computer if you don’t have enough free space or something.