Why iOS 12 Update Failed?
Here are some common reasons why iPhone/iPad/iPod touch won't update to iOS 12.
iOS update requires stable and active network irrespective of whether you are upgrading through iTunes or over the air. If the Internet connection is poor, the update will fail.
If you are updating your device via iTunes: iTunes is an old version; you are not using the original USB cable; antivirus software or firewall settings obstruct the update; poor computer performance, etc.
If you are updating your device to iOS 12 over the air: your device has insufficient space; the server is too busy to enable connection; Settings App is not running well; not enough power in the battery, etc.
iOS 12 software is not installed properly for some unknown reasons.
The Most Common Problems Occurred during iOS 12 Upgrade
Check Internet Connection
Force Quit Settings App
Reset All Settings
Force Restart the Device
Update iTunes to the Latest Version
Common Issues You Might Meet in iOS 12
Below are some of the issues that occur in iOS 12. Click the tabs to discover more about the solutions.