You cannot delete an update after it installs, but you can remove it before installation starts

Once iOS finishes installing on your iPhone, there is no built-in way to uninstall it. The update becomes your operating system. However, if you have downloaded an update but have not yet installed it, you can delete the downloaded file from your phone's storage. This frees up space and prevents the automatic installation prompts that appear after a few days.

The steps differ depending on whether you want to stop an update that is waiting to install, or whether you want to understand what happens if you delay or refuse an update that keeps appearing.

Key Takeaways

  • Go to Settings > General > iPhone Storage to see downloaded updates taking up space, and swipe left on the update name to delete it.
  • Deleting a downloaded update stops the automatic installation reminders, but Apple will offer it again in a few days or weeks.
  • If an update is actively installing, you cannot stop it mid-process — you must let it finish or force-restart your phone, which risks data loss.
  • Refusing updates indefinitely is possible but leaves your phone vulnerable to security gaps that Apple patches in each release.

How to delete a downloaded update before it installs

Open Settings on your iPhone and tap General. Then tap iPhone Storage. Scroll down until you see the iOS update listed — it will show a version number like "iOS 18.2" and the file size in gigabytes. Tap on the update name.

A red circle with a minus sign appears on the left side of the update entry. Tap it, then tap Delete. The downloaded file is removed from your phone immediately. You will see the storage space return to your available storage total.

After you delete it, your iPhone will not prompt you to install that specific version for several days. When Apple releases the next update, you will see a new notification. You can delete that one the same way.

What happens if you ignore or delay an update

If you do not delete a downloaded update, your iPhone will remind you to install it. The reminders start gently — a notification that an update is ready — and become more persistent. After about five days, your phone may restart automatically at night to install the update, usually between 2 a.m. and 4 a.m.

You can postpone this automatic installation by tapping "Remind Me Later" when the prompt appears. Each time you choose this option, you buy roughly 24 more hours before the next reminder. However, the automatic installation will eventually happen unless you delete the downloaded file.

Some iPhone models and iOS versions allow you to tap "Install Tonight" to choose a specific time, which gives you more control over when the restart happens. This is useful if you want to install the update but need to finish something first.

If an update is already installing or stuck

If your iPhone is in the middle of installing an update, you cannot cancel it through Settings. The installation process is designed to complete without interruption. Stopping it mid-installation can corrupt your system files and leave your phone unable to start.

If the installation appears frozen — the progress bar has not moved in over an hour — you can force-restart your iPhone. The method depends on your model. On iPhone X and newer, press and quickly release the Volume Up button, press and quickly release the Volume Down button, then press and hold the Side button until the Apple logo appears (usually 10 to 15 seconds). On iPhone 8 and earlier, press and hold the Top (or Side) button and the Volume Down button together until the Apple logo appears.

A force restart will interrupt the installation, but your phone may restart the update process automatically when it boots back up. If the update keeps failing, you may need to connect to a computer and use Finder (on Mac) or iTunes (on Windows) to restore your iPhone through a wired connection.

Why updates keep reappearing even after you delete them

Apple releases updates in stages. When you delete an update, you are deleting the version Apple offered to your specific phone on that day. A few days or weeks later, Apple may push the same version again, or a newer one. Your phone checks for updates regularly, especially when connected to Wi-Fi and plugged in overnight.

This is by design. Apple wants most users to install security patches and bug fixes. Deleting an update is a temporary action, not a permanent refusal. If you want to avoid updates for longer, you can turn off automatic updates in Settings > General > Software Update > Automatic Updates, and toggle off "Download iOS Updates" and "Install iOS Updates." This stops your phone from downloading updates in the background, but you will still see notifications offering them.

The security trade-off of staying on older iOS versions

Each iOS update includes fixes for security vulnerabilities that hackers can exploit. If you stay on an older version for months, your phone remains exposed to those vulnerabilities. Attackers can use them to steal passwords, access photos, or install malware.

Apple typically supports the current iOS version and the previous two versions with security updates. Once a version falls out of support, it receives no more patches. If you delay updates for a year or longer, you may eventually find yourself on an unsupported version with no way to patch new threats.

Deleting a downloaded update for a few days is low-risk. Refusing all updates indefinitely is a different choice, and it is worth understanding the trade-off before you make it.

Frequently Asked Questions

Can I downgrade to an older iOS version after updating?

No. Apple does not allow downgrades through Settings. Once you install a new iOS version, you are locked to it or newer versions only. The only exception is within a brief window (usually two weeks) after a new version releases, and even then, you need a computer and Finder or iTunes to attempt it.

Will deleting a downloaded update affect my apps or data?

No. Deleting a downloaded update file removes only the installation package, not your apps, photos, messages, or any other data. Your phone continues to work normally on your current iOS version.

What if my iPhone keeps automatically installing updates even after I delete them?

Turn off automatic updates in Settings > General > Software Update > Automatic Updates. Toggle off both "Download iOS Updates" and "Install iOS Updates." You will still receive notifications about available updates, but your phone will not download or install them without your action.

Is it safe to force-restart my iPhone during an update?

Force-restarting during an update is risky and should only be done if the installation is clearly frozen and has not progressed in over an hour. It can corrupt system files. If possible, let the installation finish, even if it takes several hours.

How much storage space does a typical iOS update take?

iOS updates range from 1 to 4 gigabytes depending on the version and your iPhone model. Larger updates may require you to delete apps or photos temporarily to make room for the download.