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10 Tech How-To

How to Update iPhone, iPad, or iPod Touch with iTunes

Guide 10-20530 · Updated · Step by step

Updating your iPhone, iPad, or iPod touch through iTunes (or the Finder on macOS Catalina and later) is a reliable way to install the latest iOS or iPadOS when a wireless update isn’t working, when you’re low on storage, or if you prefer a wired connection. This guide walks you through the entire process, from preparation to troubleshooting, so you can update safely without losing data.

What You’ll Need

  • A Windows PC or Mac with iTunes installed (on macOS Catalina or later, use Finder instead of iTunes).
  • The original USB cable that came with your device, or a certified third-party cable.
  • Enough free space on your computer for the iOS update file (usually 3–5 GB).
  • Your device passcode (to unlock and trust the computer).
  • A stable internet connection.
  • At least 50% battery on your device, or keep it plugged into power during the update.

Step-by-Step

  1. Update iTunes (or macOS) first. On Windows, open iTunes and go to Help > Check for Updates. On Mac, go to System Settings > General > Software Update to ensure your Mac is current. Using an outdated iTunes can cause errors.
  2. Back up your device. Connect your iPhone, iPad, or iPod touch to your computer using the USB cable. If you see a “Trust This Computer?” alert on your device, tap Trust and enter your passcode. In iTunes (or Finder), select your device icon. Under Backups, choose This Computer and click Back Up Now. Wait for the backup to finish before proceeding.
  3. Check for the update. With your device selected, look for the Summary tab (or General in Finder). Click Check for Update.
  4. Download the update. If an update is available, a pop-up will show the latest iOS/iPadOS version. Click Download and Update. This downloads the update file to your computer—this may take a while depending on your internet speed.
  5. Confirm and wait. You may be prompted to enter your device passcode. After that, your device will restart and show a progress bar. Keep it connected until the update completes and your device restarts normally. Do not unplug during this time.
  6. Set up your device. Once the update finishes, your device will boot up. If you backed up, you can restore from that backup if needed (though a standard update usually preserves your data).

Common Mistakes

  • Using the wrong port or cable: A damaged or non-certified cable can cause connection drops. Use the original cable and a USB port directly on your computer (avoid hubs).
  • Not backing up: While updates rarely erase data, a power outage or interruption can corrupt the update. Always back up first.
  • Interrupting the update: Unplugging the device or closing iTunes mid-update can “brick” your device. Patience is key.
  • Ignoring storage space: Your device needs enough free space to install the update. If you get a “Storage Full” error, free up space by deleting unused apps or media.
  • Forgetting to trust the computer: If you skip the “Trust” prompt, iTunes won’t recognize your device. Unlock your device and tap Trust when prompted.

Tips

  • Use a wired connection rather than Wi-Fi for the download to avoid interruptions.
  • If you’re on a laptop, keep it plugged in during the update to prevent it from sleeping.
  • If the update is large, consider updating overnight when you don’t need your device.
  • After the update, check for app updates in the App Store to ensure compatibility with the new iOS version.
  • If you have multiple Apple devices, update them one at a time to avoid confusion.

Troubleshooting

Device not recognized by iTunes/Finder: Try a different USB port, restart your computer, and reinstall the Apple Mobile Device USB driver (on Windows). On Mac, check that Finder has permission to access your device under System Settings > Privacy & Security > Files and Folders.

Error 4013, 4000, or similar: These usually indicate a connection or software issue. Update iTunes, restart your computer, and try again. If it persists, put your device into recovery mode and restore from a backup.

Update stuck on “Preparing” or progress bar: Wait at least 15 minutes. If it’s still stuck, force restart your device (press Volume Up, then Volume Down, then hold the Side button until the Apple logo appears) while keeping it connected.

“Storage Full” error: Delete unnecessary photos, videos, and apps. Or, use the “Offload Unused Apps” feature in Settings > General > iPhone Storage.

Update fails with “Unable to Check for Update”: Check your internet connection, disable any VPN, and ensure your computer’s date and time are correct.

Frequently Asked Questions

Will updating with iTunes erase my data?

No, a standard update preserves your data. However, if you restore from a backup or use recovery mode, you may lose data, so always back up first.

Can I update without a computer?

Yes, you can update wirelessly via Settings > General > Software Update. This guide is for when you prefer or need to use a computer.

Why does iTunes say my device is not eligible for this version?

Your device may not support the latest iOS. Check Apple’s compatibility list for your model.

How long does the update take?

Download time depends on your internet speed; installation typically takes 10–30 minutes.

What if I don’t have iTunes on my Mac?

On macOS Catalina or later, use Finder. Connect your device and select it under Locations in the sidebar.

Can I use a Windows PC with iTunes to update my iPhone?

Yes, iTunes is available for Windows and works the same way as on older Macs.

Related

General steps for current mainstream versions; menus can differ by device and version. See the disclaimer or report an error.

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