How to Fix iPhone Error 4013 During Restore or Update
What error 4013 means
Error 4013 shows up during one of the most stressful phone operations there is: restoring or updating an iPhone through a computer. You connect the phone, iTunes or Finder begins the process, and somewhere in the middle the progress bar stalls and the 4013 dialog appears. Apple’s own description of this error family is blunt — it’s a communication failure between the iPhone and the computer, or between the computer and Apple’s servers, during the restore.
The good news is that the cause is overwhelmingly mundane. In the majority of cases, 4013 is a connection problem, not a dead phone: a frayed or uncertified cable, a flaky USB port, or a hub that drops the data link for a fraction of a second at exactly the wrong moment. These are cheap, fast fixes, and they resolve most 4013 reports. That’s why the troubleshooting below starts at the physical layer and only moves to software — and eventually hardware — after the easy answers are exhausted.
There is, however, a real worst case to know about up front. When 4013 survives every cable, port, computer, and software fix, it usually means the iPhone’s storage chip or logic board can no longer sustain the data transfer the restore demands. That’s a hardware fault, and no settings change will fix it — the phone needs a technician. But don’t jump there prematurely; work the steps in order, because most people never reach step six.
Common causes
- Faulty or uncertified cable: cheap or damaged cables carry power fine but drop data intermittently — exactly what triggers 4013.
- Bad USB port or hub: front-panel ports, keyboards, docks, and USB hubs deliver inconsistent power and data compared to a direct rear port.
- Outdated iTunes or macOS: old versions of the computer-side software mishandle current iPhone restores.
- Security software interference: antivirus or firewall tools can block the connection to Apple’s verification servers mid-restore.
- Failing storage or logic board: if every cable and computer fails the same way, the phone’s hardware can’t complete the transfer.
How to fix error 4013 — step by step
Start with the cable and port — the physical layer is where this error lives most of the time.
- Swap the cable and USB port. Error 4013 is most often a communication problem between the iPhone and the computer, and the cable is the number-one suspect. Switch to a genuine Apple cable or an MFi-certified third-party cable, and plug it directly into a different USB port on the computer — avoid USB hubs, docks, keyboard pass-through ports, and front-panel ports, which deliver inconsistent power and data.
- Restart both the iPhone and the computer. With the phone disconnected, restart the iPhone (Settings > General > Shut Down, then power it back on) and restart the computer fully — not just sleep and wake. Reconnect the phone directly with the known-good cable, reopen iTunes or Finder, and try the restore or update again.
- Update iTunes or macOS. Mismatched or outdated software on the computer side triggers 4013 more often than people expect. On Windows with the Microsoft Store apps, open the Microsoft Store > Library and update the Apple Music and Apple Devices apps (or in classic iTunes, Help > Check for Updates). On a Mac, go to the Apple menu > System Settings > General > Software Update, install everything pending, and restart.
- Temporarily disable security software. Firewalls and antivirus programs sometimes cut the iPhone’s connection to Apple’s verification servers mid-restore, which surfaces as 4013. On Windows, go to Windows Security > Virus & threat protection > Manage settings and temporarily turn off real-time protection and the firewall. Retry the restore, then re-enable everything immediately afterward.
- Retry the restore in Recovery Mode. Put the iPhone in Recovery Mode (quick-press Volume Up, quick-press Volume Down, then press and hold the Side button until the recovery screen appears), connect it to the computer with the good cable, and choose Update first when iTunes or Finder offers Update or Restore. If Update completes, your data is preserved; if it fails again, choose Restore.
- Try a different computer, then contact Apple Support. If 4013 survives a known-good cable, a different port, updated software, and Recovery Mode on a second computer, the phone’s storage or logic board is likely failing to communicate — a hardware fault that cables cannot fix. Book service at Apple Support or an authorized provider; if the phone is out of warranty, a local repair shop can diagnose the storage chip.
Did this fix it? Quick checklist
- Genuine Apple or MFi-certified cable, plugged directly into a rear USB port with no hub or dock
- iTunes (or macOS) fully updated, both devices restarted, security software temporarily off
- Recovery Mode retry completed — Update attempted first, Restore only with a backup
- The restore finishes without 4013, or a second computer confirms it’s a hardware fault
If the restore completes but you’re unsure your data survived, check Settings > your name > iCloud > iCloud Backup after the phone boots to confirm the latest backup before you wipe or restore anything again. And if the phone still throws 4013 on a second computer after every step here, stop repeating the same attempts — each failed restore is time you could be spending at the service desk instead.
Frequently asked questions
What does iPhone error 4013 mean?
It means iTunes or Finder lost communication with your iPhone in the middle of a restore or update. Most often the cause is a bad cable or USB port, but outdated computer software or a genuine hardware fault can produce it too.
Will error 4013 erase my photos and data?
The error itself erases nothing, but a full restore does wipe the iPhone — always try Update first in Recovery Mode to preserve your data, and only choose Restore when you have a backup or have exhausted every other option.
Why does error 4013 keep happening even with a good cable?
If a genuine cable and a direct USB port don’t fix it, the next suspects are outdated iTunes or macOS, security software blocking Apple’s servers, or a hardware fault. Work through those in order; repeat 4013s across two computers point at hardware.
Is error 4013 caused by jailbreaking?
A jailbroken phone can complicate restores, but 4013 isn’t specific to jailbroken devices — it hits stock iPhones just as often, usually from cable, port, or software issues rather than anything the user did.
How is error 4013 different from error 4014?
They appear at the same stage of a restore and share the same troubleshooting steps. Error 4014 more often points at a corrupted or blocked software download, while 4013 more often points at a broken connection between the phone and the computer.