Unable to Install Update, An Error Occurred Installing iOS 12/12.1? How to Fix

“Unable to Upgrade. An error occurred installing iOS 12/12.1 on your iPhone or iPad? Here in this article, we’ll show you some troubleshooting tips to fix this update problem.

By iMobie | Posted on: Sep. 17, 2018, Last Updated: Jan. 24, 2019

Aimed at making your iPhone and iPad experience more responsive, faster and delightful, iOS 12 is coming to the public today with some great features like Memoji, Measure app and Screen Time. But while installing the new iOS 12 update, some people got an error saying “Unable to Install Update. An error occurred installing iOS 12” . And the latest updated version of iOS 12.1 also has this problem.

If you encounter this problem also, how can you settle this problem? Now let’s follow this tutorial and get 6 simple tips to fix this iOS 12/12.1 install error on your iPhone iPad.

Related Reading: Most Common iOS 12 Problems and Potential Solutions

5 Tips to Fix “An Error Occurred Installing iOS 12/12.1”

Tip 1. Remove and Download the iOS Update Again

You can also try to delete and download the iOS 12/12.1 update again. Just go to

  1. Settings > General > iPhone Storage
  2. Find the iOS 12/12.1 update in the list > tap it and tap Delete Update.
  3. Then go to Settings > General > Software Update and download the latest iOS update.

After removing the old iOS 12/12.1 installer, and re-downloading, you may be able to successfully get the new update.

Tip 2. Check Network Settings

There are chances that your network settings cause the problem of “Unable to Install Update. An error occurred installing iOS 12/12.1”. Check your network settings and make sure the cellular network is turned on. You can reset your network settings in Settings > General > Reset Network Settings under “Reset” tab.

 Check Network Settings

Check Network Settings to Fix Unable to Install iOS 12/12.1

Tip 3. Update iOS 12/12.1 with iTunes

If you are unable to install iOS 12/12.1 over the air, then updating your device to iOS 12/12.1 via iTunes is an option to go. Run iTunes > connect your device to iTunes via a USB cable > click on your device > Summary > Check for Update > Download and Update.

Tip 4. Disable Low Power Mode.

Many users wound restart their iPhone or iPad in this situation, but what if restarting device still won’t work? Some users suggest that disabling low power mode and restart device is helpful.

Tip 5. Check Storage on iPhone/iPad

Your iPhone/iPad may be unable to install iOS 12/12.1 due to insufficient storage on device. You can go to Settings > Storage > iPhone Storage to check your available storage and free up space for iOS 12/12.1.

Share the tips to fix “Unable to Install Update, an error occurring installing iOS 12/12.1, and help people get out of this issue.

The Bottom Line

With the simple tips we offered above, it’s quite easy to fix the problem of an error occurred installing iOS 12/12.1. Surely, you can downgrade iOS 12/12.1 to iOS 11 if you don’t satisfy with it. And if you find this post useful, please share it. And you can comment any ideas on how to solve this issue if you find some better solutions.


Member of iMobie team, an Apple fan as well as an anime lover. Like to share solutions on iOS and Android related problems.