Cellular Update Failed

Sorry about that.

I suggest that your contact Apple Support directly, using this link:--> https://getsupport.apple.com/?caller=kbase&SG=SG003&category_id=SC0999&symptom_id=99976

or make an appointment and have your iPhone inspected at an Apple Store or Authorized Service Provider among this list:--> Apple – Location Selector

Regards and best of luck.

Giulio

Follow these instructions:--> If you see an Update Failed or Apple Pay Not Available alert after iOS update or restart - Apple Support

If the issue still persists, contact Apple Support using the link provided in the last line of the above article.

Regards

Giulio

Well, on a windows PC, after creating a full backup of your device, as written in the support article I posted (#4 step), you need to "Ctrl+Click" Check for Update:

4) In Finder, click General. Or in iTunes, click Summary, then follow these steps:

• • On a Mac: Command-click Check for Update.
  • On a Windows computer: Control-click Check for Update.

Your computer will download and reinstall the current version of software on your device. Don't disconnect your device from your computer until the download completes.

If you continue to see either of the alerts above, take your iPhone or iPad to an Apple Authorized Service Provider or make a Genius Bar reservation at an Apple Store. You can also contact Apple Support.

Regards

Giulio