How to Fix iTunes Error 4005 on iPhone Restore
What error 4005 means
Error 4005 is an iTunes or Finder error that appears during an iPhone restore or iOS update. The restore starts, the progress bar moves, and then iTunes stops with the message: the iPhone could not be restored — an unknown error occurred (4005). Your iPhone is usually left in recovery mode, showing the computer-and-cable screen.
The code signals a communication failure: data stopped flowing between the iPhone and the computer in the middle of the restore. In the large majority of reports, the cause is mundane — a worn or uncertified USB cable, a flaky USB port, a USB hub in the chain, outdated iTunes or macOS, or security software interfering with the connection.
What makes 4005 different from its sibling restore errors is that it is more frequently associated with an actual iPhone hardware fault. If you work through the full sequence below — certified cable, new port, updated software, a second computer, and a DFU-mode restore — and 4005 still appears, the honest diagnosis is usually hardware, not software. The good news: most people never get that far, because the cable and port steps fix it.
Common causes
- Faulty or non-certified USB cable: the number-one cause — worn or cheap cables drop data mid-restore.
- Bad USB port or hub in the chain: underpowered ports, hubs, and dongles interrupt the connection.
- Outdated iTunes, Finder, or computer OS: old software mishandling the restore protocol.
- Security software interference: antivirus or firewall blocking iTunes’ communication with the device.
- iPhone hardware fault: failing storage or board-level issues — suspected only after a DFU restore fails on a second computer.
How to fix error 4005 — step by step
Start with the cable and port — they cause the large majority of 4005 failures. Work down the list in order.
- Change the cable and USB port. Use a genuine Apple or MFi-certified Lightning or USB-C cable — worn or uncertified cables are the single most common trigger. Plug the cable straight into the computer: no USB hubs, no keyboard ports, no extension dongles. Try a different USB port as well, preferably a rear port on a desktop PC. Then retry the restore.
- Update iTunes, Finder, and the computer OS. On Windows with the Microsoft Store apps, open the Microsoft Store > Library and install updates for the Apple Music and Apple Devices apps (in classic iTunes, go to Help > Check for Updates). On a Mac, open the Apple menu > System Settings > General > Software Update. Restart the computer afterward, then retry the restore.
- Force-restart the iPhone and retry. On iPhone 8 and 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. (On iPhone 7: hold Volume Down + Sleep/Wake together. On iPhone 6s and earlier: hold Home + Sleep/Wake.) Once it restarts, put it back into recovery mode and retry the restore in iTunes or Finder.
- Temporarily disable security software. Pause your antivirus and firewall: on Windows, go to Windows Security > Virus & threat protection > Manage settings, and temporarily turn off real-time protection and the firewall. Retry the restore immediately, then re-enable everything as soon as the attempt finishes.
- Try a different computer. Restore the iPhone on a different computer with a fresh iTunes or Finder install. If the restore completes there, your main computer’s USB subsystem or software stack is the problem — not your iPhone. If error 4005 follows you to a second computer with a good cable, suspect the iPhone itself.
- Do a DFU-mode restore, then seek repair. Connect the iPhone to the computer. Press and quickly release Volume Up, press and quickly release Volume Down, then hold the Side button for 10 seconds. While still holding Side, press and hold Volume Down for 5 seconds, then release the Side button but keep holding Volume Down for about 10 more seconds. The screen stays black — that’s DFU mode. iTunes or Finder will detect a device in recovery and offer a restore. If error 4005 still appears after a clean DFU restore on a second computer, the iPhone has a hardware fault and needs professional repair. Note: DFU wipes the iPhone, so restore your data from an iCloud or computer backup afterward.
Did this fix it? Quick checklist
- Using a certified cable plugged directly into the computer, no hubs
- iTunes or Finder and the computer’s OS fully updated
- The iPhone force-restarts cleanly and re-enters recovery mode
- The restore completes without 4005 (or the DFU restore succeeds)
If 4005 survives new cables, new ports, a second computer, and a DFU restore, stop retrying — the pattern points to a hardware fault. Book a diagnostic at an Apple Store or an authorized repair provider and mention error 4005; it’s a recognized diagnostic code that helps them zero in on the fault.
Frequently asked questions
What does iTunes error 4005 mean?
It means iTunes or Finder could not finish communicating with your iPhone during a restore or update. The restore process aborted because the connection dropped or the iPhone failed to respond — typically a cable, USB port, or software problem, though persistent cases point to iPhone hardware.
Is error 4005 a hardware problem?
It can be, more often than with errors like 3194. Apple’s documentation associates 4005 with a communication failure that hardware faults can cause. But you should only conclude hardware after a clean DFU restore fails on a second computer with a certified cable — most reported 4005 cases still turn out to be cable or port issues.
What’s the difference between error 4005 and error 4013?
Both are restore communication errors and share most fixes: cable, port, software updates, DFU restore. In practice, 4005 is more frequently linked to an actual iPhone hardware fault, so if it survives the full fix sequence on two computers, professional diagnosis comes sooner.
Will a DFU restore erase my iPhone?
Yes — DFU mode wipes the iPhone completely. Restore your data afterward from an iCloud backup or a backup on your computer. Make sure you know your Apple ID password before you start.
Error 4005 keeps appearing on a second computer. What now?
Stop retrying on your own — that pattern strongly suggests an iPhone hardware fault. Book a diagnostic at an Apple Store or an authorized repair provider and mention error 4005; it’s a recognized diagnostic code that helps them narrow the fault.