Hello there !
Try updating your device again using the same network. If you still see one of these messages, try updating your device using another network or update your device with your computer. If the issue happens again after trying to update with multiple networks, remove the update.
Learn more about iOS and iPadOS updates.
If you still can't install the latest version of iOS or iPadOS, try downloading the update again:
- Go to Settings > General > iPhone Storage.
- Find the update in the list of apps.
- Tap the update, then tap Delete Update.
- Go to Settings > General > Software Update and download the latest 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 your computer using Finder or iTunes.