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iPhone Errors

How to Fix iTunes Error 4016 When Restoring iPhone

By ErrorFix · Updated October 26, 2026 · 8 min read

Error 4016Plain English: iTunes or Finder lost contact with your iPhone in the middle of a restore, so the restore stopped partway through.
Quick answer: Error 4016 means the computer lost its connection to your iPhone during a restore or update. Restart the computer and phone, use an Apple-certified cable plugged straight into the computer, update iTunes or macOS, and turn off security software for the attempt. If that fails, use recovery mode (Update first), then DFU mode as a last resort. Full steps below.

What error 4016 means

Error 4016 shows up when you restore or update an iPhone through a computer, and iTunes or Finder interrupts the process with the message: The iPhone could not be restored. An unknown error occurred (4016). The wording is vague, but the failure itself is well understood: 4016 belongs to the same family as the better-known restore errors 4013, 4014, and 4015, and Apple groups it in the 4000-through-4016 range of update and restore errors — a range that covers problems with the USB connection and security software. In plain terms, the computer started talking to the phone and the conversation broke down partway through.

That breakdown usually has an ordinary cause. A worn Lightning or USB-C cable, a USB hub that cannot sustain a long transfer, an iTunes version that predates your iOS version, or an antivirus program that decides the restore traffic looks suspicious can each stop the process cold. In those cases the phone itself is perfectly fine, and the fix sits on the computer side of the cable. The scarier possibility is hardware: on phones that have been dropped, repaired, or exposed to water, the same error can point at a damaged charging port, a failing storage chip, or a logic-board fault, which no amount of software troubleshooting will fix.

The trick is telling those two situations apart without wasting a day. Work through the steps below in order, cheapest first. Most 4016 cases clear up in the first four steps. If the error follows the phone to a second computer with a different cable and a DFU restore, that is the signal the phone itself needs a repair shop — and you will know it for certain rather than guessing.

Common causes

How to fix error 4016 — step by step

Start with the connection and the software. The heavier tools — recovery mode and DFU — come only after the easy fixes have had their chance.

  1. Restart the computer and the iPhone, then reconnect with a certified cable. Restart the computer completely and force restart the iPhone, then connect the phone with an Apple-certified Lightning or USB-C cable. A fresh restart clears stuck USB drivers and background processes, and a known-good cable removes the most common cause of 4016 before you try anything more involved.
  2. Plug the iPhone directly into the computer and try another USB port. Remove every hub, dock, adapter, and keyboard USB port from the chain and plug the cable straight into a USB port on the computer itself. If the restore still fails, try a different port — front-panel ports and older USB 2.0 ports can be unreliable during the long data transfer of a restore.
  3. Update iTunes, the Apple Devices app, or macOS to the latest version. Outdated updater software is a known trigger for 4016, especially when the iPhone runs a newer iOS version than the computer software understands. On Windows, update the Apple Music and Apple Devices apps through the Microsoft Store, or in classic iTunes go to Help, then Check for Updates. On a Mac running macOS Catalina or later, restores run through Finder, so open the Apple menu, go to System Settings, then General, then Software Update. Restart the computer after updating, then retry the restore.
  4. Temporarily turn off security software and VPNs on the computer. Antivirus programs, firewalls, and VPN software can cut the connection between iTunes or Finder and Apple's servers in the middle of a restore, which is exactly the kind of interruption 4016 reports. Turn the protection off only for the restore attempt, stay on a network you trust, and switch the protection back on as soon as the restore finishes or fails.
  5. Try recovery mode and choose Update before Restore. Connect the iPhone to the computer, then enter recovery mode: quickly press Volume Up, press Volume Down, then press and hold the Side button until the recovery screen appears. In iTunes or Finder, choose Update first — this reinstalls iOS while trying to keep your data. Only choose Restore if Update fails, because Restore erases the phone completely.
  6. Try a DFU mode restore if recovery mode fails. DFU mode loads no iOS at all, so it can succeed where a normal restore cannot. With the phone connected to the computer, press Volume Up, press Volume Down, then hold the Side button for 10 seconds, then keep holding the Side button while also holding Volume Down for 5 more seconds, then release the Side button while continuing to hold Volume Down until the computer detects a device in recovery. Click Restore in iTunes or Finder and let it download a fresh copy of iOS. This erases everything, so only use it when you have a backup or have accepted the data loss.
  7. Try a different computer, and get the hardware checked if the error follows the phone. If 4016 survives every step above, borrow a different computer and repeat the restore with a different cable and port. If the restore succeeds there, the original computer was the problem — update its USB drivers or reinstall iTunes or the Apple Devices app. If the error follows the phone to a second computer, the fault is likely in the phone's charging port, storage, or logic board, and it needs Apple Support or an authorized repair shop.

Did this fix it? Quick checklist

If 4016 keeps appearing on a second computer with a different cable, stop repeating the same restore — you have already ruled out the software side, and further attempts will not change the answer. Back up what you can, and let Apple Support or an authorized repair shop check the hardware. Bring the full story: which steps you tried, and that the error survived recovery mode and DFU.

Frequently asked questions

What does iPhone error 4016 mean?

It means iTunes or Finder lost contact with your iPhone partway through a restore or update and had to abort. The message reads: The iPhone could not be restored. An unknown error occurred (4016). Apple groups 4016 with errors 4000 through 4016, a range that covers USB connection and security-software problems, so the cause is usually the cable, the port, or something on the computer interrupting the transfer — not the phone itself.

Is error 4016 the same as error 4013 or 4014?

They are close relatives in the same restore-error family and they share the same fixes: a good cable, a direct USB port, updated software, security software off, recovery mode, then DFU. The number alone does not change the troubleshooting — what matters is whether the error survives every software step, which is what separates a connection glitch from a hardware fault.

Will fixing error 4016 erase my photos and data?

The error itself erases nothing — it only means the restore or update could not finish. But recovery-mode Restore and DFU mode do erase the phone completely, so always choose Update first in recovery mode, and only use Restore or DFU when you have a backup or have accepted losing the data.

What if error 4016 appears on a second computer too?

Then the computer side is ruled out and the problem is almost certainly in the phone: a worn or damaged charging port, a failing storage chip, or a logic-board fault, especially on a phone that has been dropped or exposed to water. Stop repeating restores — they will not change the answer — and book a check with Apple Support or an authorized repair shop, telling them the error survived recovery mode and DFU on two computers.

Should I try DFU mode first for error 4016?

No. Work in order: restart and a certified cable, a direct USB port, updated iTunes or macOS, security software off, then recovery mode with Update. DFU mode is the last resort because it erases the phone and takes the longest, and most 4016 cases are fixed long before you need it.

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