If you’re trying to install an iOS or iPadOS software update and see an error message that says “Unable to Install Update – An error occurred installing iOS 18.4.1” (or any iOS/iPadOS x.x.x) with an option to Retry or to Remind Me Later, you may be understandably frustrated. Thankfully, this is usually quite easy to fix.
This “Unable to Install Update. An Error Occurred” failure and error can happen with basically any iOS or iPadOS version so it’s not limited to any particular release. It’s typically only experienced when attempting iOS and iPadOS update as through OTA via the Settings app, and in fact one of the troubleshooting approaches uses a computer to install the update instead. But first let’s see if some of the other tricks can resolve the Unable to Install Update error for you.
Backup First
Before you start troubleshooting, make sure you backup the iPhone or iPad, whether to iCloud, to Finder, or to iTunes. Backing up is important so that if something goes awry during the update process, you can restore and not lose your data.
Make Sure You’re on Wi-Fi & Online
Make sure the iPhone or iPad is connected to a wi-fi router and is actively online.
An easy way to test this is to open Safari and visit a website, like geekschalk.com or google.com.
If you are having Wi-Fi problem, unplug your router from the power outlet, wait at least 30 seconds, then plug your router back in. Then, check if that fixes your problem.
Try Again Later
A few users found the issue magically disappeared after a short while.
It’s possible Apple was gradually pushing the full installer to its servers, and the update failed earlier due to incomplete packages.
Apple’s servers may have been overloaded or temporarily unavailable, preventing the iOS or iPadOS update from installing properly. In some cases, simply waiting and trying again later has resolved the issue. Simply have a little patience, wait 15 minutes, or even a few hours, then try again. You can easily check Apple’s system status.
You may notice the two choices with the alert dialog are “Retry” and “Remind Me Later”, and that’s because often simply choosing to Retry, or trying again later, works to resolve the problem.
Delete the Update, Reboot the iPhone / iPad, Try Again
Some iPhone and iPad devices can occasionally get stuck with this error message for no apparent reason, but sometimes simply deleting the update and restarting the device helps.
- Go to Settings > General > [Device name] Storage.
- Find the update in the list of apps.
- Tap the update, then tap Delete Update.
- Next, reboot the iPhone or iPad. You can turn it off and back on again for a soft reboot, or do a hard reboot on modern iPhone and iPad devices with Face ID by pressing Volume Up, Volume Down, then holding the Power button.
- Go to Settings > General > Software Update and download the latest update.
Use a Computer for the iOS / iPadOS Update
Connecting the iPhone / iPad to a Mac or Windows PC and installing the iOS / iPadOS update through a computer seems to always work even if you are constantly getting the “Unable to Install Update” error message.
- Connect your iPhone or iPad to a Mac or Windows PC using appropriate cable.
- For newer Macs, you can select the iPhone in the Finder and choose to “Update” through there.
- For older Macs and Windows PCs, you can launch iTunes and choose to “Update” in iTunes.
A variation of this is to use ISPW to install the iOS or iPadOS update, but that’s a bit more complicated.
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Did you resolve the “Unable to Install Update – An error occurred installing iOS x.x.x / iPadOS x.x.x” error message on your iPad or iPhone? Which troubleshooting trick worked for you? Did you find another approach? Share with us your own experiences in the comments.
