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11 Tips to Fix Unable to Install Update. An Error Occurred Installing iOS 17

DoubtUser Concern

“Anyone else getting an error when trying to install iOS 17? I got an error saying 'Unable to Install Update. An error occurred installing iOS 17'. I retried like 5 times and always got the same error. Any suggestions?”

Apple regularly releases iOS updates to fix bugs, add additional features, or improve the functions of iPhone and iPad. You can easily update your device wirelessly by going to Settings > General > Software Update.

Recently, when installing the iOS 17 or iPadOS 17 update, some users got the error "Unable to Install Update. An error occurred installing iOS X.X." with the option to Retry or to Remind Me Later.

Don't panic. This is one of the most common iOS update issues, and there are several ways to fix the problem on your own. Read on to check out.

unable to install ios update error

Why Does My iPhone Say Unable to Install Update?

First, let's see why you are getting the error "Unable to Install Update. An error occurred installing iOS 17". Usually, the following issues may prevent you from updating your iPhone or iPad:

  • Your iPhone or iPad is not compatible with iOS 17 or iPadOS 17.
  • Your device battery is very low.
  • Your WiFi connection is weak or not working at all.
  • The iPhone does not have enough free space for the update.
  • iPhone/iPad cannot connect to the Apple update server.

Back-Up Your iPhone/iPad First

Before troubleshooting the error, make sure you backup the iPhone or iPad in case something goes wrong during the iOS update process:

  • Use iCloud: on your iPhone or iPad, go to Settings > [your name] > iCloud > iCloud Backup.
  • Use iTunes/Finder: Connect your iPhone or iPad to your computer, open iTunes or Finder, select your device, and click "Back Up Now."
  • Use a Third-party Tool like FoneGeek Backup & Restore (iOS) to backup data on your iPhone or iPad more flexibly.

Once you made the backup, try out these solutions introduced below to resolve the unable to install iOS update error.

Tip 1. Essentials to Download & Install iOS 17 Update

1.1 Ensure Your iPhone is Compatible

Please note that iOS 17 is no longer compatible with the iPhone X, iPhone 8, and iPhone 8 Plus. If you're unable to install iOS 17/iPadOS 17, please first check if your iPhone or iPad is on the supported devices list.

  • iOS 17 Supported Devices: iPhone 15 series, iPhone 14 series, iPhone 13 series, iPhone 12 series, iPhone 11 series, iPhone XS and XS Max, iPhone XR, iPhone SE (2nd generation or later).
  • iPadOS 17 Supported Devices: iPad Pro 12.9-inch (2nd generation and later), iPad Pro 10.5-inch, iPad Pro 11-inch (1st generation and later), iPad Air (3rd generation and later), iPad (6th generation and later), iPad mini (5th generation and later).

1.2 Ensure That iPhone Battery is Over 50%

To install an iOS update, you must ensure that the device's battery is more than 50%. If the battery is less than 50%, you'd better connect the device to charging and download the iOS update again when the battery is over 50%.

1.3 Check Network Connection

It would be best if you had a good and stable internet connection to do the iOS update. Poor internet connection may interrupt the update process. So, check your network connection before installation:

  • Make sure you're on Wi-Fi, and it is actively online. You can test this by opening Safari and visiting any website.
  • If possible, try to update your iPhone or iPad using a different Wi-Fi network.
  • Also, you can try to turn off WiFi and then turn it back on to refresh the internet connection.
  • You can also try to reset network settings on your device by going to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings.

reset network settings iphone

1.4 Check Your iPhone Storage

The iOS 17 installation process may also be interrupted due to insufficient storage space on your iPhone. In this situation, you should check the iPhone storage and make sure there is enough space to download and install an iOS update.

  • Firstly, go to the iPhone's update page by clicking Settings > General > Software Update. Then, the required storage to install iOS 17 will be displayed. You should ensure that the free space on your iPhone is more than the data size of the iOS update file.
  • Then go to Settings > General > iPhone Storage to check the used and free storage on your iPhone. You can clear iPhone caches, junk files, and unnecessary data if you find that there is no sufficient storage to update iOS 17.

check iphone storage

1.5 Wait for a While and Try Again

Once the new iOS 17 version is released to all Apple 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 the Apple server will definitely fail to instal the iOS update file. So we suggest you be patient to try again several hours or several days later.

Tip 2. Force Quit the Settings App

Try to quit the Settings app if you cannot install the iOS 17 update on your iPhone.

  1. Swipe up from the bottom of the screen and drag the Settings app card up to force quit it.
  2. Then open the Settings app again and go to General > Software Update to check if the new iOS update is listed here.

force quit settings app

Tip 3. Restart Your Device

Restarting your iPhone and iPad sometimes does work to fix the issue of an error occurring when installing iOS 17. And it can be the easiest step for you to take. Simply power off your device and then power it on to see if it helps to solve the update problem. If not, keep reading.

restart iphone

Tip 4. Force Restart iPhone

If a simple restart doesn't work for you, a force restart may be your best bet. Here's how to force restart your iPhone or iPad:

  • Press and quickly release the Volume Up button.
  • Then press and quickly release the Volume Down button.
  • After that, press and hold the Side button until you see the Apple logo.

force restart iphone

Tip 5. Remove and Download the Update Again

If you still fail to install the iOS 17 update, try simply removing and downloading the update again. Here's how:

  1. On your iPhone, go to Settings > General > iPhone Storage and locate the update in the list of apps.
  2. Tap on the update and choose the option of Delete Update.
  3. Restart the device and then go back to Settings > General > Software Update to download the latest update again.

delete software update on iphone

Tip 6. Fix iOS Update Error without Data Loss

If the "Unable to Install Update. An error occurred installing iOS 17" issue still appears after trying all the tricks, the best solution that 100% works for you is using FoneGeek iOS System Recovery. It is easy to use and will never delete or damage the current data stored on the iPhone.

Besides the iOS update issue, a wide range of other iOS issues can also be resolved, such as iPhone stuck on Apple logo, black screen, boot loop, etc.


This program is 100% secure to use and highly recommended by Mobile Mall, GetDroidTips, Inspirationfeed, Techjury, Pakainfo, and many other media sites. Advanced technology is also used to support all iOS models and versions, including the latest iPhone 15 and iOS 17.

Step 1: After you have downloaded FoneGeek iOS System Recovery on your computer, launch it and connect your device with a USB cable. Then click Standard Mode.

choose repair mode

If the program does not detect your iPhone or iPad, you can put the device into DFU/Recovery mode as per the instructions on the interface.

put iphone into recovery mode

Step 2: Once the device is successfully detected, the program will display the device information and provide the newest firmware package. You can select the firmware of iOS 17 and click on Download.

download firmware

Step 3: Click on Fix Now, and the program will begin to install the newest iOS firmware. Keep the device connected with the program and do not use it until the installation process is completed.


Tip 7. Update iOS 17 with iTunes/Finder

You can also connect your device to a Mac or Windows PC and install the iOS update through iTunes or Finder. Here's what you need to do:

  1. Connect your iPhone or iPad to your computer using a USB cable and launch iTunes or Finder.
  2. When iTunes/Finder detects the device, click on the device icon and tap Check for Update to install the new iOS update version.

check for update


We have listed the 11 simple solutions above. Compared with other complicated tips, FoneGeek iOS System Recovery will be quite easy to remove the issue of an error occurring when installing iOS 17.

What's better, if you have any other errors after updating to iOS 17, you can also downgrade iOS 17 to iOS 16 without iTunes via this tool. If you have any better ideas or opinions about this article, you can leave your comments below.

Fay J. Melton

Fay J. Melton has explored the area of technology and software for more than 5 years and he is enthusiastic about helping users solve various technology issues.

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