Apple today has stopped signing iOS 11.4 following the release of iOS 11.4.1. This mean, users can no longer install iOS 11.4 on their iPhone or iPad.
Apple keeps on releasing the new iOS version with security updates while stopping the older version to keep their OS safe.
So if you are running either lower or higher than iOS 11.4 versions than you can not go back to iOS 11.4 ever again.
The current iOS 11.4.1 which was released a week ago came with some update like improvements to Find My Airpods & HomePod.
Apple is also testing iOS 12 and has released Beta 4 so far. This new iOS consists of many new features and changes. Check them out now!
Also Check:
iOS 12 New Features, Release Date and More
How to Enable or Disable Automatic Software updates in iOS 12 on iPhone or iPad