How to Fix the “An Error Occurred Installing iOS 15” Issue?

Many users are unable to install iOS 15 on their iPhones or iPad. After downloading the latest Apple OS and selecting the “Install Now” option, they get an error saying “Cannot upgrade. An error occurred installing iOS 15 on iPhone or iPad. Try again later/remind me.” Here, we offer some solutions.

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Solution 1: Check If Your Device Supports iOS 15

Why does an error occurred when installing iOS 15? If your device is not used with 15, then you may get the “Cannot install update – Error installing iOS 15” message on iOS. So if first make sure your device is in the following supported list.

iOS 15 supported iPhone devices:

iPhone 13/13 Pro (Max)/13 mini, iPhone 12/12 Pro (Max)/12 mini, iPhone SE 2020, iPhone 11/11 Pro (Max), iPhone XS Max/XS/XR/X, iPhone 8/8 Plus, iPhone 7/7 Plus, iPhone 6s/ 6s Plus, iPhone SE, iPod touch 7

iPadOS 15 supported iPad devices:

iPad mini (6th generation), iPad Air (4th generation), iPad Air (5th generation), iPad Pro 11-inch (1st generation), iPad Pro 11-inch (2nd generation), iPad Pro 11-inch (3rd generation), iPad Pro 12.9-inch (3rd generation), iPad Pro 12.9-inch (4th generation), iPad Pro 12.9-inch (5th generation), iPad mini 4, iPad mini (5th generation), iPad (5th generation), iPad (6th generation), iPad (7th generation), iPad (8th generation), iPad (9th generation), iPad Air 2, iPad Air (3rd generation), iPad Pro 9.7-inch, iPad Pro 10.5-inch, iPad Pro 12.9-inch (1st and 2nd generation)

Solution 2: Force Restart Your Device

Force restart can help you dump all junk files of your device and refresh its memory. Here’s a quick trick to fix minor system glitches to get rid of any iOS errors. So, you can try to force restart your iPhone or iPad when you encounter the “an error occurred installing iOS 15” error.

Solution 3: Reset Network Settings

Resetting network settings will update all information related to the network used on your phone. You can reset the network settings to fix the “an error occurred installing iOS 15” error by following the steps below. Go to your Settings and open the General option. Scroll down and click the Reset option. Then, click the Reset Network Settings option.

Solution 4: Check & Manage Storage Space

iOS updates require considerable free storage space. And because of the lack of memory, the “Failed to install update – An error occurred installing iOS 15” message usually pops up.

Step 1: Open Settings.

Step 2: Click General. Select iPhone Storage.

Step 3: If there’s little free space left, please delete the apps that you don’t really need or clear the data of some apps manually.

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Solution 5: Update Your iPhone with iTunes

If all of the above solutions are useless you can try the other way to update your iOS version: updating your device using iTunes.

Step 1: Download and install the latest iTunes version on your PC.

Step 2: Connect your iPhone to your computer. Then, you need to make the device trust the computer if you connect your iPhone to the computer for the first time.

Step 3: Open iTunes and select your iPhone.

Step 4: Press Summary and select Check for Update. Press Download and Update. You need to enter the password for your iPhone if asked.

Final Words

How to fix “an error occurred installing iOS 15”? This post has introduced 5 ways to get rid of the issue. If you come across the same issue, try these solutions. If you have any better ideas to fix this error, you can share them in the comment zone.