[Solved] Why can't I install iOS 15? How to fix the error?

Having trouble installing iOS 15? Follow along as we explore various ways to address these issues.

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Why Can't I Install iOS 15? Fixing the Update Error Now

Apple introduced iOS 15 in June 2021, with the stable update rolling out around September. Since then, many have been enjoying the tech giant's iconic operating system. Because of the pandemic, Apple introduced a Face ID feature that could recognize users even when they were wearing masks.

They include:

• WiFi or mobile data not functioning
• VPN or other virtual network configurations
• Device compatibility issues
• Older mobile phone devices

No matter what issue you're having, you might see the same error message: “Unable to install update.” So let's go through various fixes you can try.

How to Recover iOS 15 Data Without Backup

Before attempting to upgrade your phone to a newer operating system, you must first copy all of the data from your iPhone. Even if you haven't been backing up, there are ways to ensure that you make a proper backup, such as with an iOS recovery software tool.

This will ensure that your data is secure when you upgrade your phone to iOS 15. Why use this tool? Because

• Enables direct file recovery.
• Permits selective data recovery from iTunes backups.
• Recovers data from iCloud backups.
• Extracts only the data you need.
• Lets you create new backups for future use.
• Supports recovering messages and creating backups from all apps.

Thus, using this tool ensures that your device is ready and helps you avoid data loss. Hence, after completing this step, you can proceed with the next one.

Step 1. Select Recovery Mode

Plug your iPhone into the computer and open the MobiSaver app. Select the recovery mode on the left – “Recover from iOS Device” – and click “Start.”

Step 2: Scan iPhone to Find Lost Data

MobiSaver will scan your iPhone 13/12/11/X/XR/XS/8/7/6/5/4 automatically and find the existing data as well as some lost data for you.

Step 3: Preview and Recover iPhone Data

You can choose to recover lost data like photos, videos, contacts, messages, memos, voicemail, or other files from your iPhone 13/12/11/X/XR/XS/8/7/6/5/4. Then, click “Recover” to save these data to another location.

How to Fix Unable to Download/Install/Update iOS 15 on iPhone

If you've done your part with the preparations, it's time to stop wondering why won't my iOS 15 install. So, let's explore all nine ways to download, install, and update to iOS 15 on a supported iPhone. Here we go.

Some users have reported issues with downloading or installing iOS 15. Below is a step-by-step guide to resolving this problem, accompanied by screenshots where necessary. Before each solution, I'll provide a transitional paragraph explaining the context. ### Transition Paragraph: Before we begin, ensure your device meets the system requirements for iOS 15 and is connected to a stable Wi-Fi network. Download or installation problems might occur due to an unstable network, insufficient storage, or incorrect settings. We'll address these issues systematically. ### Solution 1: Check Network Connection **Step 1:** Make sure your iPhone is connected to Wi-Fi. Go to "Settings" > "Wi-Fi" and confirm a strong connection. **Step 2:** Refresh the network. Tap the "i" icon next to the Wi-Fi network and choose "Forget This Network." Reconnect and try downloading iOS 15 again. ### Solution 2: Free Up Storage Space **Step 1:** Navigate to "Settings" > "General" > "iPhone Storage" to view available space. **Step 2:** Delete unnecessary apps, photos, or videos to make room. You can also use the "Optimize iPhone Storage" feature to save space. ### Solution 3: Update Software Settings **Step 1:** Access "Settings" > "General" > "Software Update." **Step 2:** If an update is available, tap "Download and Install." If iOS 15 isn't detected, ensure "Automatic Updates" is turned off, then turn it back on. ### Solution 4: Reset Your Device **Step 1:** Backup your data ("Settings" > [Your Name] > "iCloud" > "iCloud Backup") just in case. **Step 2:** In "Settings" > "General" > "Reset," select "Erase All Content and Settings." This will erase your device and restore it to factory settings. **Step 3:** Afterward, restore from the backup using iTunes or Finder. Try installing iOS 15 after your device restarts. Follow these steps, providing screenshots for clarity. If the issue persists, it's recommended to contact Apple Support for professional assistance.

Solution 1: Check iPhone Compatibility with iOS

If you're unsure whether your iPhone is compatible, you can check on Apple's official website, but here's a list of devices that support iOS 15.4 for your convenience:

- iPhone X, XR, XS, XS Max - iPhone 11, Pro, Pro Max - iPhone 12, Pro, Pro Max, Mini - iPhone 13, Pro, Pro Max, Mini - iPhone 6, 6s Plus - iPhone 7, 7 Plus - iPhone 8, 8 Plus - iPhone SE (all generations)

So how do you find out which one you have? Here's how.

Step 1: Go to “Settings.”

Step 2. Tap General > About.

Step 3: Tap “Get Your iPhone Info.”

Here, you'll find the information you need. Then, check if your phone is eligible for the latest update.

Solution 2: Set the device to Airplane mode

Once you've confirmed compatibility, we'll try to clear any potentially interfering network settings. That's as simple as putting your device in Airplane Mode.

Step 1: Tap Settings.

Step 2. Find Airplane Mode.

Third, open it.

This will ensure that your device isn't connected to any WiFi or cellular networks.

Solution 3: Restart or Reset Your iPhone

Next, try restarting your device. iPhones store cache in memory and elsewhere, so this can resolve the issue. Here's how:

1. Tap on Settings on the home screen.

Step 2: Go to General, then scroll down and tap Shut Down.

After turning off the device, press and hold the Power button for 3-5 seconds. Wait for the device to turn back on.

Solution 4: Check your Wi-Fi and reset network settings

In some cases, your WiFi device or router might be interfering with the update. Especially if you see an error message like "Update could not be verified," try these steps.

1. Unplug your WiFi device from power for 10 seconds. 2. Plug it back in. 3. Wait for the device to boot up and reconnect to it. 4. Try updating again. 5. Attempt to connect to a different WiFi network.

These are problems that are most likely to be solved through such an approach.

Solution 5: Turn off Low Power Mode

Your phone might be in Low Power mode, which prevents it from running at full speed. Therefore, your phone needs to be able to run at full power when updating the operating system. Here's how to turn off Low Power mode:

Step 1: Go to the "Settings" menu.

Step 2: Scroll down to the “Battery” section.

Step 3: Turn off Low Power Mode.

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This will ensure that your phone is running properly.

Solution 6: Free Up iPhone Storage Space

iOS updates 15 and later are at least 2 gigabytes in size. So if you have less than 8 to 10 gigabytes of free space on your iPhone, you might not be able to download the update. So you'll want to check and remove anything that's taking up space, like this.

Step 1: Open Settings.

Step 2: Tap “General.”

Step 3: Scroll down and tap “iPhone Storage.”

Here, you should see everything that's taking up space. Delete any apps and data that you don't need to free up at least 8-10 GB of storage space.

Solution 7: Delete the beta and download the update again

If you have the iOS 15 beta installed, you might not be able to install this update. You'll need to remove the existing beta first. Here's how.

Step 1: Go back to the Settings menu.

Step 2: Tap “General.”

Step 3: Click on “Profile.”

Step 4: Find and delete the iOS Beta software profile.

This will free up space and remove the beta from your Apple device.

Solution 8: Update iOS 15 via iTunes

You can also download iTunes on your computer and use the program to update your iPhone through that, so you should do that.

Step 1: Download and install iTunes

Step 2: Connect your iPhone to the computer.

Step 3: Launch iTunes, and click on “Summary” in the sidebar.

Step 4: Click Check for Updates.

Step 5: After this message appears, click the Download and Install button.

Solution 9: Wait for some time or try again later

If you've tried for a day or two, it's possible that there's an issue on Apple's end. In that case, try again later, and it should work.

Last Words

That's the correct way to make sure your iPhone is updated with the latest operating system. So, make sure to use the MobiSaver tool to keep your data safe. Then, try all the steps mentioned in this article to recover your crucial data.