By Michael | Last Updated
Q: "My iPhone keeps getting the "Unable to install update" error when installing iOS 15.7 and it fails even when I reacquire the package, what should I do? "
Most people choose to update their iPhone system to the latest version in order to pursue a better experience of using their device. But when you are updating iOS, your iPhone will show "Unable to check for updates" ; "Unable to install updates" ; "An error occurred while installing iOS 16, try again later or remind me" and so on. What causes the iOS update error and how to deal with it? This article will discuss this series of problems in detail and share effective solutions, which can be also applied to iOS 17.
"Why won't my phone update to ios 15.7", you may want to figure out why this happens before getting to the fix for how to fix iPhone not updating to iOS 15. There are various reasons why the iPhone can't update system situation occurs.
1. iOS is not compatible with the iPhone. If your device is not compatible with a particular version of iOS, attempting to install it will result in an "Unable to Install Update" error with a detailed message "An error occurred installing iOS 18/17/16/15". Therefore, it’s essential to verify that your device supports the iOS version you’re trying to install.
iOS 15 supported devices：
iOS 16 supported devices：
2. Insufficient storage space on your device. iOS update packages usually require 700-800 megabytes to be installed correctly, so when your device does not have enough storage space, the iOS update will fail. You can check the available space on your iPhone by following this path: Open the "Settings" > "General" > "iPhone Storage" to see the available storage space on your device.If the device memory is not enough you should backup iPhone to Windows PC and clear space before updating iOS.
3. iPhone low battery or unstable network causes the update to be interrupted. When the iPhone battery is low or the network is unstable, the device will automatically pause iOS update, which will cause the iPhone update to fail. You should update your device when your iPhone is fully charged and the network environment is stable.
4. The device is in iOS beta version. You should delete the beta files before updating iOS, please follow the path below :
Step 1: On your device go to "Settings" > "General" > "VPN and Device Management".
Step 2: Scroll down and select "Profiles" > "iOS Beta Software Descriptors" > "Delete Descriptor Files" > restart your device and then you can try to download and install the iOS update package again.
5. Apple server overload. When the server is overloaded and a large number of users are affected, you just need to wait for a moment and update your iPhone's iOS version when Apple's servers are back to normal.
After trying the above methods, my iPhone still can't update to iOS 15/16, what should I do? iSunshare iOS Repair Genius can help you fix iOS update failure in minutes without losing data. As a powerful iOS repair tool, it can easily fix more than 50 common system problems, including iOS update failure. Follow the tutorial below to upgrade your iPhone to the latest version.
Before you start, you should download and install iSunshare iOS Repair Genius on your computer, then check if iTunes on your computer is the latest version, if not, upgrade it. Also, make sure your iOS device is always connected to your computer with a USB cable until the repair is complete.
Step 1: Run the software. There will be two modes on the main screen of the software: "Standard Mode" and " Advanced Mode ". The "Standard Mode" can fix the system error that iOS cannot be updated to the latest version without losing data, you should prefer it.
Step 2: Click "Start" to continue.
On the next page you will see the prompt "Make sure your device is connected to PC with USB cable", then click "Next" button.
Step 3: The software will automatically recognize your device model and prepare the latest available firmware version for it. After selecting the storage path of the firmware package, click the "Download" button.
Step 4: After waiting for the firmware package verification to complete, click on the "Repair" button to start repairing your iOS system.
Soon, you will get a pop-up window indicating that the repair was successful and the device's iOS will be upgraded to the latest version and then restarted automatically.
Updating iOS for iPhone is not a difficult task, however, there are some minor problems with iOS that can cause the update to fail, when you encounter this situation, I hope this article can help you.
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