[2022 Newest] Fix Unable to Install Update iOS 16/15


Jul 25, 2022 (Updated: Jul 25, 2022) • Filed to: Fix iPhone

5K views, 5 min read


Both hardware and software technology is progressive. That is why your top-notch gadget like iPhone has had over thirteen releases. Each model has variant sequels that Apple release to match their customer's request and budget. To match their constantly improving hardware, Apple's iOS has more than 15 versions. Without equally top-notch software, your new iPhone models will not be able to function well.

Disappointedly, some users are unable to install update iOS 16/15. These users cannot access bug fixes, improved security, and new features that Apple is providing. Hence, they need to know why their iPhone is unable to install update. If your iPhone falls in this group, you will find 9 solutions for iOS being unable to install update.

Part 1. Why Is Your iOS Update Not Installing?

iOS is unable to install the update because of five main reasons:

Battery is low.

Storage is full.

Network is down, unstable, or impaired by other services like VPN.

Software glitches.

Hardware compatibility.

Part 2. How to Fix Unable to Install Update iOS 16/15

To fix iPhone unable to install update iOS 16/15, we have put together nine solutions. These solutions address all the causes given in the section above.

1Check Your iPhone Battery

If your iPhone is unable to install update iOS 16/15, chances are there is something wrong with the battery. The common issues with iPhone batteries are that they can get warm while charging or shut off unexpectedly. Apart from these general issues, a low battery can be the reason iOS is unable to install update. Hence, ensure that your iPhone battery has over 50% battery.

2Check Your iPhone Free Space

Another reason that your iOS is unable to install update may be that the memory storage is full. Insufficient storage would hinder you from downloading the update. The update screen will send you a message of there is not enough space to update your iOS. However, if there is no message on your update page, you can check how much space your iPhone storage has left.

To check the space left on your iPhone storage:

Open the Settings app on your iPhone.

Open the General settings. Click on iPhone Storage.

check iPhone storage

Your device will give you recommendations on how to create more storage. From there, you can uninstall some apps and delete some files to create some storage.

3Force Quit the Settings App

Some users have complained of getting messages like “Unable to install update An error occurred installing iOS 16/15”. One of the causes of this error message is that the Settings app is glitchy. In such instances, you can resolve iPhone unable to install update iOS 16/15 by forcing the Settings app to quit. Here are the steps to follow if you want to force quit the Settings app on your iPhone.

On iPhone with Face ID, swipe up the screen from the bottom and hold your finger on it.

On iPhone with the Home button, quickly double-click the Home button.

Drag the Settings app to force quit it.

force quit settings app

After some seconds, open Settings and try downloading and installing the iOS update again.

4Restart Your iPhone

The efficiency of restarting a gadget to get anything done is undeniable. The reason for such efficiency is that every gadget has processing storage. Once you restart the device, the storage is refreshed. With a refreshed processing storage, your iPhone will not be unable to install update iOS 16.

Here is how to restart iPhone X/11/12/13/14:

Press and hold the Side and Volume down buttons till you see the power-off slider.

restart iPhone

Drag the slider to turn off your iPhone and after a few seconds, turn on your iPhone by pressing down the Side button.

To restart iPhone SE/8/7/6/5:

Press down the Power or the Top button till you see the power-off slider. Drag the slider to turn off your iPhone.

Press down the same button again till you see the Apple logo to turn on your iPhone.<

5Reset Network Settings

The network can be a significant hindrance to downloading and installing an update. After all, the update is online. Hence, you need to be sure that your network is not off, slow, or being hindered by third-party apps like VPN. Hence, turn off your VPN.

Suppose iPhone is unable to install update iOS 16/15 persists after checking your network. In that case, you should reset the network settings on your device. Follow these steps to complete the process.

Open the Settings app on your iPhone. Click the General setting and the Reset option.

From the reset options listed, click on Reset Network Settings.

reset iPhone network settings

Once the reset is done, you can reconnect your network and try to update your iOS again.

6Update iPhone with Another Network

If resetting your network settings does not work, you can use another network. The most palpable solution when you have used mobile data is to connect your iPhone to a stable Wi-Fi network. If you are using a Wi-Fi network already, like the one at a coffee shop, disconnect from it. You can try another network or use your office or home Wi-Fi.

7Remove and Download Update Again

When your iOS update download is not complete, your iPhone may be unable to install update. In such cases, you can remove the update you first downloaded and download a new update. Then, install the new update. Here is how to remove and download a new update.

Open the Settings app on your iPhone. Open the General settings and click on iPhone Storage.

On the list of recommended files to delete, click on iOS 16/15.

On the new screen, click Delete Update.

delete iPhone update

8Fix iPhone Unable to Install Update with WooTechy iPhixer

Removing software glitches can be more thorough than resetting the network and restarting one's device as the former is the culprit of iPhone unable to install iOS 16/15 at most cases. Hence, you can use our third-party app to fix your iPhone is unable to install update issues. WooTechy iPhixer is a repair tool that you can access online without the help of an expert. You can use it to upgrade and restore your iOS without data loss.

iPhixer – The Perfect iOS Issues Solution




  • Fix all iOS issues without data loss such as unable to install update iOS, unable to verify update iOS, iPhone frozen during update, etc.

  • Support all iPhone models and iOS versions including the latest iOS 15.6/iOS 16.

  • Update your iPhone to the latest version while not causing any issues and removing all potential bugs during the whole process.

  • Better then iTunes, iPhixer updates and restores your iPhone on the computer without the use of network connection, thus preventing all errors.

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Steps to fix iPhone unable to install update iOS 16/15 with WooTechy iPhixer:

Download and install the program on your computer, then launch it and connect your iPhone to the computer with the appropriate lightning connection cable.

Pick a repair mode, preferably the Standard Mode, since it prevents data loss. Clicking on the Next button at the bottom of the app's screen.

select standard mode

Then, the app will ask you to download the firmware that will fix your iPhone, so click Download.

download iPhone firmware

Once the download is complete, the software will be extracted. Click on the Start button, and your iPhone will be repaired while installing the appropriate iOS successfully.

fix iPhone unable to install update iOS 16/15

9Update iPhone with Computer

If you have exhausted all the above solutions, you can use your PC/Mac to update your iPhone. You need to have the iTunes/Finder app on your PC/Mac before you can use it to update an iPhone. Here is how to go fix iPhone is unable to install the update with PC.

Use an appropriate USB lightning cable to connect your iPhone to your PC/Mac.

Unlock the device so that iTunes/Finder can recognize your iPhone model.

Click on the phone that appears on your iTunes/Finder screen to see its Summary.

Choose the option to Check for Update. You will be notified when the installation finishes.

update iPhone on computer


After going through this article, it is unlikely that you will still be having iOS 16/15 unable to install update issues. These nine solutions especially the all-in-one iOS system recovery programWooTechy iPhixer fix all the known causes of iPhone being unable to install update. iPhixer has the highest success rate and the fastest speed to fix any of your iPhone issue. Just download it and give it a try!

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