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6 Ways to Fix 'Unable to Install Update. An Error Occurred Installing iOS 12'

by  Fay J. Melton  |  Wednesday April-03 2019  15:11:16

To make iPhone, iPad and iPod touch perform better and respond more quickly than before, Apple released iOS 12, iOS 12.1 and iOS 12.2. While the new iOS version fixes most bugs on iPhone, it also comes with several unpredictable problems. When installing iOS 12, some users got an error of ‘Unable to Install Update. An Error Occurred Installing iOS 12’. The same error has also arisen with the release iOS 12.1 and iOS 12.2. Fortunately, you will no longer be involved in this kind of problems since we are here to provide you with the top 6 tips for you. So, if your iPhone has an error installing iOS 12 update firmware, try out these solutions introduced in this post.


1. Check Network Connection

Perhaps the network connectivity is not that good if an error occurred installing iOS 12. In fact, three conditions need to be satisfied in order to successfully install iOS 12: stable network connection, enough device storage and fully-charged battery. So, one of the preparations to update iPhone or iPad is to ensure that the device is connected with a stable WiFi network.

  • Firstly, check the network environment of router. If you don’t know how to check it, you can also test the same network on your computer, laptop or other devices.
  • If the network on other devices is good, but it is bad only on your iPhone, then you’d better turn off the Wifi connection for a few minutes, then turn it on. You can also choose to reset network settings on iPhone.
  • Neither of them works? Then there may be something wrong with the service provider. You can directly contact your network service provider to check for the network connection issue. 

check network connection

2. Check iPhone Storage

Is the message of ‘unable to install update an error occurred installing iOS 12’ still displayed after insuring that the network connection is normal? You should check the iPhone storage. As we know, the iOS 12 installation process may also be interrupt for insufficient storage. In this situation, sufficient iPhone storage is required to install the new iOS 12 firmware package. So, how to see the iPhone storage?

Step 1. Firstly, go to iPhone’s update page by clicking Settings > General > Software Update option. Then the required storage to install iOS 12/12.1/12.2 file will be displayed. You should ensure that the free space on iPhone is more than the data size of iOS update file.

Step 2. Then go to Settings > General > iPhone Storage to check the used storage and free storage on your iPhone.

check iphone storage

Step 3. You should clear iPhone cache afterwards if you found that there is no sufficient storage to update iOS 12.

3. Wait for a While and Try Again

Once the new iOS 12/12.1/12.2 version is released to all iOS users, tens of thousands of users can hardly wait to have the new version downloaded and installed immediately. Then the problem arises. Too much traffic on Apple server will definitely result in the failure of installing iOS update file. So we suggest you be patient to try again several hours or several days later.

4. Fix ‘An Error Occurred Installing iOS 12’ Without Data Loss

This is the ultimate solution that is 100% work for you if ‘unable to install update an error occurred installing iOS 12’ issue still appears after trying all the tricks above. PR iOS System Recovery is easy to use and will never deleted or damage the current data stored on iPhone.

Actually, you still have other methods to try, but most of them will result in data loss. So we are here introduce to you an efficient powerful program that will 100% work and install iOS 12 update file without data loss. Besides this kind of iOS upgrade issue, a wide range of other iOS issues can also be resolved with this iOS System Recovery.

This program is 100% secure to use to is recommended by famous media sites, such as PC Advisor, PC World, etc. Advanced technology is also used to support all models of iPhone, iPad and iPod Touch.


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Step 1. After you have downloaded PR iOS System Recovery, launch it and click ‘iOS System Recovery’.

select ios system recovery

Step 2. Connect your device with an original cable and click the option of ‘Start’.

check device information

Step 3. When the iPhone is detected by the program, the next steps is to put the iPhone into DFU mode as the instructions on the interface.


Step 4. Once the iPhone is successfully put in DFU mode, PR iOS System Recovery will detect the iPhone information and the newest firmware package. You can select the firmware of iOS 12, 12.1 or 12.2 and click on ‘Repair’.


Step 5. The program will begin to install the newest iOS firmware. Keep you iPhone connected with the program and do no use it until the installation process is completed. Then restart your iPhone and check whether the iOS version is successful updated.

repair ios system

5. Force Restart iPhone

Try to force reboot your iPhone, iPad and iPod Touch does work sometimes to fix the issue of an error occurred installing iOS 12. And it can be the simplest way. Just press and hold the Power button and Home button at the same time until the Apple logo is displayed on the screen.

6. Update iOS with iTunes (Data Loss)

iTunes is also a great tool to update the iOS version for iPhone, iPad and iPod Touch. Since update with iTunes will wipe all the data on iPhone, it will be necessary to perform a backup first. Both iTunes and iCloud can be used as a backup tool.

After performing the backup, connect the device with computer and run iTunes (Ensure that the iTunes is of the latest version). When iTunes detects your iPhone, select the icon and click Summary option, then click ‘Check for Update’ and ‘Download and Update’ to install the new iOS update version.

check for update

We have listed the 7 simple solutions above. Compared with other complicated tips, these fixes will be quite easy to remove the issue of an error occurred installing iOS 12/12.1/12.2. What’s better, if you have any other errors after updating to iOS 12, you can also downgrade iOS 12 to iOS 11 without iTunes via PR iOS System Recovery. If you have any better ideas or have opinions with this article, you can leave your comment below.