How can I update my iPhone SE to iOS 15.8?

Use a computer or the Software Update function in Settings. If you encounter a specific issue other than the one listed below, describe it in this thread.

An unit which shows 17.6.1 as available can't be updated to a version older than that; Apple stopped signing them.

(255028)

Hello~ Click on below and review…

Update iOS on iPhone - Apple Support

If your iPhone or iPad won't update - Apple Support*

Note once in the article* above you may click on other highlighted tabs of interest…including one that will show you as *Niel* suggests how to use your computer to update.

~Katana-San~