Recently, many users who have been attempting to upgrade their Apple devices to iOS 15 have been met with an error that prevents them from installing the latest version of the operating system. The error message An error installing ios 15 pops up immediately after the user clicks to begin the installation process, and there doesn’t seem to be anything that can be done about it. Fortunately, there are several reasons why there is an error installing ios 15, and we’ll explain all of them below so you can better understand what’s going on and how you can get back on track with your upgrade plans.
Step 1: Uninstall iOS 15 and then reinstall it.
The first thing you should do if you get an error installing ios 15 is to uninstall it and try downloading it again.
Sometimes, bugs in older versions of iOS will prevent newer updates from being installed, so deleting your current version and downloading it again can resolve several common installation issues.
This process also works when uninstalling/reinstalling applications or restarting your device. Still, sometimes when you delete your operating system during a failed update process, you may lose data such as photos and apps stored on your device.
Make sure to back up all important information before proceeding with these steps.
Step 2: Look for free space on your iPhone or iPad.
Today Apple released its latest update, which is expected to be iOS 15. It’s already been released for iPhone 8 and iPhone X users.

Users have been complaining about an error message: error installing ios 15. Fortunately, here we offer a solution for you.
The error in installing ios 15 means there isn’t enough space on your device to install iOS 15.
- So, to fix it, you need to check your Storage first.
- Then you can go on with updating your device with iTunes or iCloud. If there is still not enough space on your device after checking Storage, you can remove some data from your device by iTunes or iCloud backup restore method.
Suppose some apps are not used often but take up much space on your devices, like game apps or useless apps. You can delete them from your device directly or backup them via iTunes/iCloud and restore them later when needed again if they are important for daily use.
Step 3: Check your iOS 15 devices’ network settings
If you see an error message when attempting to install iOS 15, there’s a good chance it has something to do with your WiFi or data connection.
If you’re experiencing Error 2 or Error 3 during setup, look at your WiFi settings on your iPhone, iPad, or iPod touch.
- If you find that WiFi is turned off, ensure that it’s turned on and that your device is connected to a solid network.
- Be sure to check under Settings > WiFi for a list of available networks.
- Additionally, if you see Airplane Mode enabled (under Settings > Airplane Mode), toggle it off.

Conclusion
Suppose you recently updated your iPhone, iPad, or iPod touch to iOS 15.0 and encountered an error installing ios 15 or something similar. In that case, you may be affected by a bug with Apple’s new update. If you are searching why an error occurred when installing ios 15, the good news is there are a few ways to fix it and get back up and running without having to restore. However, restoring it is your only option if you want to keep all of your data. We’ll walk through each method so you can decide which one will work best for you.