The Ultimate Guide to Fix iPhone Won’t Update to iOS 16/15.7 [iOS 17 Included]

by Anna Sherry   Updated on 2023-07-21 / Update for  iOS 15

The newest version of iPhone operating system is iOS 16. It comes with a wide range of amazing features that give iPhone users a more fulfilling experience. So, you may want to update your iPhone too.

Unfortunately, iOS 16 may not be installed on your iPhone successfully. This is indicative of an array of issues that will be discussed in details below. Also, we will provide 5 spectacular solutions to fix your iPhone won’t update to iOS 16/15.7.

iOS 17 has been available for a while. If your iPhone cannot be updated to iOS 17, you can also use the solutions below to solve your problem.

Part 1. Why My iPhone Won’t Update to iOS 16/15

My iPhone won’t update, what could be the problem? If you are asking this question, it is paramount to highlight why iPhone won’t update 15. Here are the most commons reasons for iOS won’t update.

  • Incompatibility with iOS 15.7: For anyone using an old iPhone, your device may not be compatible with the latest version of the operating system. Notably, iOS 15.7 will be compatible with the following devices:

    iOS 15.4 supported device

    Note: iOS 16 is compatible with iPhone 8 and newer iPhones. And iOS 17 is compatible with iPhone XR and later iPhones.

  • Insufficient Storage Space: Normally, iOS 15.7 requires over 2 GB of storage space. However, you are required to have around 5 GB of free space on your iPhone before you can download and install iOS 15.7. So, if iOS 15.7 won’t update on your device, it could because of insufficient storage space.

  • Poor WiFi Connection: A good Wi-Fi connection is required to update iOS 15.7 on your iPhone. Therefore, if the iPhone update won’t install, you should note that poor Wi-Fi connection could be the problem. You may want to check your internet connection before you start downloading the update.

  • Low battery: It is important to note that iPhone won’t download update if your battery is low. Therefore, make sure that your battery is at least 50% before you start updating to iOS 15.7

  • Corrupted Files and Bugs: Lastly, you may not be able to update to iOS 15.7 because of some corrupted files and bugs. These files and bugs will be interfering with your update; hence, the iOS update won’t install on your device.

Part 2. 5 Quick Tricks to Fix An iPhone Won’t Download Update iOS 16/15.7

My iPhone won’t let me update to iOS 15.7/16/17, what can I do? You don’t have to get worked up over this problem as we offer you 5 trusted tricks to fix it.

1. Charge your iPhone When iOS Won’t Update

If your iPhone won’t update because of the low battery, this solution is for you. All you have to do is just connect your iPhone to a charger. Make sure your battery is charged to at least 50% before you start updating to iOS 15.7

2. Free up Space on iPhone that iOS Update Won’t Install

As stated earlier, you need around 5 GB of storage space to install iOS 15.7 on your iPhone. Therefore, you should consider freeing up some space on your device. To free up space, here are the things you should do:

  • Go to the “Settings” app on your device.
  • Navigate to “General” and then “Storage & iCloud Usage”.
  • Then, click “Manage Storage”. You will see the list of the music, videos, podcasts, and other files on your device. Delete as many as you want to free up space on your iPhone.

    manage storage iphone

3. Force Restart iPhone

If your iPhone won’t update 15, force restarting it may solve the problem. You should understand that different models of iPhone use varying methods to force restart. So, you should check your iPhone model to find the right method to force restart it.

force restart iphone

iPhone 8 and later

You have to press the “Volume Up” button and release it quickly. Press the “Volume Down” button and release it quickly. Lastly, you should press and hold the side button; release it once the Apple logo shows on your screen.

iPhone 7 Series

Press and hold the “Volume Down” and “Sleep/Wake” buttons simultaneously. Release the buttons when the Apple logo shows on your screen.

iPhone 6s or iPhone SE

Press and hold the “Sleep/Wake” and “Home” buttons simultaneously. Release the two buttons when the Apple logo appears on the screen.

4. Update iOS 15.7 through iTunes

Another method you can explore to update iOS 15.7 is via iTunes. Follow the steps below:

  • With a USB cable, plug your device into a Windows PC or Mac. Afterwards, launch iTunes on the computer.
  • Look at the top of the screen and tap “iPhone” under the “Device” option.

  • Tap “Check for Update”. Then, hit “Download and Update” to install the latest iOS update on your device.
update iphone via itunes

5. Still Failed to Update iOS 15.7/16? Update in 1 Click [iOS 17 Included]

After trying the methods above, iPhone won’t let me update to iOS 15.7/16. What can I do? If you are asking this question, we have the ultimate solution for you. This solution relies on the use of Tenorshare ReiBoot. It is a powerful and well-known tool that can help you to ensure you can update iOS without much hassle. It supports iOS 17 upgrade/downgrade now.

  • Download Tenorshare ReiBoot on your Mac or Windows PC. Launch the tool and use a USB to connect your iPhone to the computer. Once the iPhone has been recognized, tap “Start” to get started.

  • Next, you should click “Standard Repair”. Please, read the instruction on the screen before proceeding to tap “Standard Repair”.

    standard repair
  • Afterwards, you need to download the latest firmware file by hitting the “Download” button. Be patient as this step may take some minutes.

    download firmware
  • After downloading the firmware file, tap “Start Standard Repair” to begin to repair the system. You need to wait for some seconds before the process completes.

    start standard repair
  • Once done, your iPhone will be the newest iOS system version .

    repair successfully

You can update your iPhone again to see if this method has solved the problem.

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We hope this article has provided comprehensive answers to most of your questions about iOS updates. Which of these solutions has helped you?