iPhone error 4013 is one of the most frustrating restore errors because it often appears right when you think the reinstall is about to finish. In practice, it usually sits at the intersection of three things: USB communication problems, restore-software issues, and possible underlying hardware faults. The good news is that Apple’s official workflow is clear, and if you follow it in the right order, you can separate a simple cable problem from a bigger repair case.

Direct Answer

Error 4013 means your iPhone restore or update failed because the computer lost reliable communication with the device, or the device could not complete the restore command properly. Start with a direct USB connection, an updated Mac or PC, a force restart, and an Update attempt. If that fails, restore the iPhone in recovery mode. Persistent 4013 after multiple cables and computers may point to hardware service.

Key Takeaways

• Apple treats 4013 as a restore/update failure in the 9 / 4005 / 4013 / 4014 family.
• Try Update before Restore if the option appears, because Update reinstalls iOS while attempting to keep personal data.
• Restore erases the device and installs the latest iOS version available for that iPhone.
• Apple specifically recommends another cable, another USB port, and another computer if 4013 continues.
• If manual IPSW restore is part of your workflow, the file must match the device and still be signed by Apple. If not, you can hit build-eligibility errors instead of solving 4013.

Quick Facts

Requirements Before You Start

• A Mac with Finder if using macOS Catalina or later
• A Windows PC with the Apple Devices app
• Or iTunes if the PC or older Mac workflow still requires it
• A direct USB connection to the computer, not a keyboard port or hub
• A good Apple or Apple-certified cable
• A backup, if the iPhone is still readable
• Enough time for the software download to complete without disconnecting the device

When This Works

• The cable is damaged or unstable
• The USB port is unreliable
• Finder, Apple Devices app, macOS, or iTunes is outdated
• The iPhone is stuck in recovery mode
• The iPhone is stuck at the Apple logo after a failed update
• The original restore attempt failed mid-process

When This Won’t Work

• The iPhone has a deeper hardware fault
• Multiple computers and cables produce the same 4013 result
• Buttons required for recovery mode do not work
• The firmware file is wrong for the device
• The build is no longer signed by Apple
• A network/security issue is blocking Apple’s update servers

What You Lose

This is the most important decision point: Update reinstalls iOS while trying to keep personal data. Restore erases the iPhone and installs the latest iOS version available for that device.

Warning: If you move from Update to Restore, plan around data loss unless you already have an iCloud or computer backup.

What Happens Next

After a successful restore, the iPhone restarts, iOS is reinstalled, you set the device up again, and you can restore from backup if one exists.

What Causes iPhone Error 4013?

Apple’s wording for the 9 / 4005 / 4013 / 4014 group is that the device may have disconnected during restore or the computer could not properly tell the device to restore. In practical terms, that usually means a communication breakdown during the update or restore chain.

Bad cable or unstable USB path

A worn cable, loose connector, underpowered USB route, or indirect connection can interrupt the restore. Apple explicitly tells users to try another USB cable, another USB port, and another computer, and to connect directly rather than through a keyboard or hub.

Outdated restore software

Apple says your Mac should be up to date, and PC users should use the latest Apple Devices app or iTunes. An outdated restore environment can create restore failures or block proper communication.

Device or hardware-level failure

Apple’s official 4013 steps end with “contact support” if the error persists after retrying with updated software, another cable, and another computer. That is the key signal: if communication fixes do not work, you may be beyond software troubleshooting. Community repair discussions also repeatedly associate persistent 4013 with underlying hardware faults, especially in boot-loop cases.

Restore Path by Platform

Cable and Connection Checklist Before You Restore

Run this checklist before attempting a full recovery-mode restore:

• Update macOS, Apple Devices app, or iTunes
• Use a direct USB connection
• Do not connect through a keyboard USB port
• Avoid USB hubs if possible
• Try another Apple or Apple-certified cable
• Try another USB port
• Unlock the iPhone if prompted
• Tap Trust This Computer if asked
• Try another computer
• If build-eligibility errors appear, verify the firmware choice and Apple signing status

Pro Tip: If your restore problem changes from 4013 to a “device isn’t eligible for the requested build” message, you are no longer dealing only with a cable issue. You are now in firmware eligibility territory.

Step-by-Step iPhone Error 4013 Fix

Step 1: Update your restore environment

Install all available updates for macOS, the Apple Devices app on Windows, or iTunes, if that is your workflow.

Step 2: Force-restart the iPhone

For iPhone 8 or later: press and quickly release Volume Up, press and quickly release Volume Down, then press and hold the Side button until the Apple logo appears.

Step 3: Reconnect with a known-good cable

Reconnect the iPhone using a reliable USB cable. If the first cable fails, switch cables before repeating the restore.

Step 4: Choose Update first

When Finder, Apple Devices app, or iTunes shows Update or Restore, choose Update first. Apple says Update reinstalls the software while trying to keep your personal data.

Step 5: If Update fails, use recovery mode

If the iPhone still will not start, put it into recovery mode. For iPhone 8 or later: connect the iPhone to the computer, press and quickly release Volume Up, press and quickly release Volume Down, then press and hold the Side button until the Connect to computer screen appears.

Step 6: Choose Restore in recovery mode

Once recovery mode appears, choose Restore. Apple states that Restore reinstalls iOS and erases your data. If the software download takes more than 15 minutes and the device exits recovery mode, let the download finish and then re-enter recovery mode.

Step 7: Retry on another cable and computer if needed

If you still see 4013, try another USB cable, try another USB port, and try another computer.

Step 8: Escalate if 4013 persists

If recovery mode restore still fails after Apple’s connection and software steps, Apple recommends contacting support or getting service.

Using IPSW to Fix Error 4013

If you are troubleshooting 4013 with a manually downloaded IPSW, keep these rules in mind: the IPSW must match the exact iPhone model, the firmware must still be signed by Apple, and using the wrong or unsigned build can trigger a different failure, such as “This device isn’t eligible for the requested build” or “The required resource can’t be found.”

Signed vs unsigned reality

Apple’s restore ecosystem only accepts eligible builds. Apple’s own error guidance ties “device isn’t eligible for the requested build” to restore/update failures and also notes that attempts to install an earlier iOS version can trigger restore problems. That is why checking signed status matters before using any IPSW-based workflow. For a full breakdown of how signing windows work, see our guide on what signed IPSW means and how long Apple signs iOS.

Expert Tip: A manual IPSW restore can help you control the firmware file selection, but it does not bypass Apple signing rules and it does not solve a true hardware fault.

Update vs Restore for Error 4013

Recovery Mode vs DFU Mode for Error 4013

For this specific problem, recovery mode is the documented Apple path. Apple’s consumer-facing instructions for failed iPhone updates/restores tell users to use recovery mode and then choose Update or Restore.

Start with recovery mode. Use DFU mode only as an advanced, technician-oriented escalation if your standard restore workflow is exhausted. If even deeper restore attempts keep ending in 4013 across multiple computers and cables, stop assuming it is only software and evaluate hardware/service options. For a full comparison of these two modes, see Recovery Mode vs DFU Mode: which should you use on iPhone?

Common Mistakes That Make Error 4013 Repeat

• Using an old or damaged cable
• Using a hub or keyboard USB port
• Skipping Mac/Windows app updates
• Choosing Restore immediately without trying Update first
• Disconnecting during software download
• Trying an unsigned or wrong IPSW
• Ignoring trust/unlock prompts
• Repeating the same failing computer setup instead of testing another machine

When to Stop Troubleshooting and Get Service

You should strongly consider service when 4013 appears after multiple cables and multiple computers, recovery mode restore fails repeatedly, the iPhone cannot stay connected long enough to complete the reinstall, or a required button is broken so recovery mode cannot be used reliably.

If you have already ruled out software updates, cable/port issues, another computer, and a correct signed firmware path, then the remaining issue is increasingly likely to be hardware-related rather than a normal firmware glitch. Apple’s own guidance effectively draws that line by pointing users to support after the standard restore fixes fail.

Expert Tips

• Keep the restore setup simple: one iPhone, one direct cable, one stable computer port.
• On Windows, use the Apple Devices app terminology, not outdated Finder language.
• If a different error replaces 4013, troubleshoot the new error, not the old one.
• If the issue changes to build eligibility, verify firmware signing before repeating restore attempts.

Conclusion

iPhone error 4013 is best handled as a structured restore failure, not a mystery code. Start with Apple’s own order of operations: update your software, force-restart the iPhone, use a direct good-quality cable, choose Update first, then move to recovery mode Restore if needed. If 4013 survives a second cable, a second USB path, and a second computer, stop wasting cycles and treat the case as a likely service issue. And if you are using IPSW files manually, always verify compatibility and signing status first.

For the full picture on signed firmware, upgrades, and downgrades, see our complete guide: The Complete Guide to Signed IPSW Downloads, Upgrades, and Downgrades in 2026.

Frequently Asked Questions

What causes iPhone error 4013?

It usually means the update or restore failed because communication between the iPhone and the computer broke down, or the device could not complete the restore command.

Can a bad cable cause error 4013?

Yes. Apple specifically recommends trying another USB cable if you see error 4013.

Should I use Update or Restore first?

Use Update first if the option appears. Apple says Update reinstalls the software while trying to keep personal data.

Will Restore erase my iPhone?

Yes. Restore erases the device and reinstalls the latest iOS version available for that iPhone.

How do I put an iPhone 8 or later into recovery mode?

Press Volume Up, press Volume Down, then hold the Side button until the Connect to computer screen appears.

Can Finder fix iPhone error 4013 on a Mac?

Yes. Apple’s current Mac workflow uses Finder on macOS Catalina or later for update and restore actions.

What should Windows users use instead of Finder?

Windows users should use the Apple Devices app, or iTunes in older workflows.

Can I fix error 4013 with a downloaded IPSW?

Sometimes a manual IPSW workflow can help, but only if the file matches the device and is still signed by Apple. Unsigned or ineligible builds will fail.

What does “device isn’t eligible for the requested build” mean?

It means the firmware you’re trying to install is not eligible in Apple’s restore system, often because it is not signed, not compatible, or the restore environment cannot properly reach Apple’s update servers.

Does error 4013 always mean hardware damage?

No. It can be caused by cable, USB, or software issues first. But if it persists after Apple’s recommended steps on multiple setups, hardware becomes more likely.

Should I try another computer?

Yes. Apple explicitly recommends trying the restore on another computer.

What if recovery mode restore still fails?

Apple says you may need support or service if recovery mode cannot update or restore the device.