Why doesn’t my iPhone let me update it?
It won’t let me update my phone , it keeps saying error
[Re-Titled by Moderator]
iPhone SE, iOS 15
See the suggestions in this document If your iPhone or iPad won't update - Apple Support
If it is literally only saying "error" and that alone then we really don't have anything to work with. In that case if the document doesn't solve the issue, contact Apple:
Contact Apple. Click here --> Choose your country or region - Official Apple Support Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.
or:
Contact Apple for support and service --> "See a list of Apple phone numbers around the world."
Click here --> Contact Apple for support and service - Apple Support