Problem with the software update
Their is a problem with the downloading of software update
iPhone X, iOS 12
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Get help with over-the-air iOS updates - Apple Support
Or
Remove and download the iOS update again
If you still can't install the latest version of iOS, try downloading the update again:
- Go to Settings > General > [Device name] Storage.
- Find the iOS update in the list of apps.
- Tap the iOS update, then tap Delete Update.
- Go to Settings > General > Software Update and download the latest iOS update.
If you don’t see the update in the list of apps or if the issue happens again, you need to update your device with iTunes