iTunes Error 4013: Why It Occurs and How to Fix on iPhone and iPad

iTunes Error 4013: Causes and Solutions

Error code 4013 appears in iTunes (or Finder on macOS) during the update or restore of an iPhone or iPad firmware. The message "Could not restore iPhone. An unknown error occurred (4013)" means that the connection between the computer and the device was interrupted at a critical stage. The device may get stuck in recovery mode (iTunes logo and cable) or enter an infinite reboot loop.

Main Causes

Error 4013 is almost always related to a connection problem, not the firmware itself. Most often, the culprits are:

• A faulty or non-original cable. The most common factor. A cable with damaged internal wires cannot provide stable data exchange.
• Dirty or damaged contacts. Dust, debris, or oxidation in the Lightning port on the device or the computer's USB port disrupt the connection.
• An unsuitable or malfunctioning USB port. Using USB hubs, front-panel PC ports, or keyboard ports often causes failures. A port directly on the motherboard is the preferred choice.
• Software conflict. Antivirus, firewall, or system utilities may block iTunes from connecting to the device.
• Outdated iTunes version. An old program may be incompatible with the latest iOS versions.
• Hardware failure of the device. A rare but possible case—damage to the power controller or Lightning port on the iPhone/iPad itself.

Step-by-Step Solution

Perform the actions in order, from simple to complex.

1. Check the Cable and Connectors

This is the first and most important step. A faulty cable causes most cases of error 4013.

1. Get an original Apple Lightning cable or an MFi-certified one.
2. Visually inspect the cable for damaged insulation, bulges, or dirty contacts.
3. Gently clean the metal contacts on both ends of the cable and in the iPhone's port with a dry, soft cloth or a cotton swab.
4. Connect the iPhone directly to a USB port on the back of the desktop computer (if using a PC). Avoid USB hubs, extenders, and front-panel ports.
5. Retry the update or restore process.

2. Perform a Full Reboot

A "cold" reboot of all components clears temporary glitches.

1. Close iTunes (or Finder).
2. Turn off the iPhone: hold the power button until the slider appears, then slide it.
3. Shut down the computer completely, not just put it to sleep.
4. Wait 30 seconds.
5. Turn on the computer and wait for a full boot.
6. Turn on the iPhone.
7. Launch iTunes and repeat the procedure.

3. Update iTunes and Disable Security Software

The issue may be a software conflict.

1. Uninstall the current version of iTunes:
   • Windows: Control Panel → Programs and Features → iTunes → Uninstall.
   • macOS: Drag the iTunes app from the "Applications" folder to the Trash.
2. Download the latest version from the official Apple website.
3. Install the downloaded file.
4. Temporarily disable third-party antivirus and the Windows/macOS firewall. You can restore settings after a successful restore.
5. Try the process again.

4. DFU Mode and Manual Firmware

This is the most effective method if the issue is at the firmware level. DFU mode (Device Firmware Update) forces the device to completely reflash.

⚠️ Important: This method erases all data on the iPhone. Before starting, ensure you have a recent backup in iCloud or on your computer.

How to put an iPhone into DFU mode:

• For iPhone 8, SE (2nd generation), and newer:
  1. Connect the iPhone to a computer with iTunes.
  2. Quickly press and release the Volume Up button.
  3. Quickly press and release the Volume Down button.
  4. Press and hold the Power button for 10 seconds.
  5. Without releasing the Power button, press and hold the Volume Down button for another 5 seconds.
  6. Release the Power button, but continue holding the Volume Down button for 15 more seconds. If the screen stays black and iTunes detects a device in recovery mode—you're in DFU.
• For iPhone 7 / 7 Plus:
  1. Connect the device to the computer.
  2. Press and hold both the Volume Down and Power buttons simultaneously.
  3. After 8 seconds, release the Power button, but continue holding the Volume Down button for 5 more seconds. The screen should remain black.
• For iPhone 6s, 6s Plus, and earlier:
  1. Connect the device to the computer.
  2. Press and hold both the Home (Touch ID) and Power buttons simultaneously.
  3. After 8 seconds, release the Power button, but continue holding the Home button for 5 more seconds. The screen should remain black.

Manual firmware upload (.ipsw):

1. Download the required .ipsw firmware file version for your iPhone model from the ipsw.me website.
2. In iTunes, hold the Shift key (Windows) or Option key (Mac) and click the "Restore iPhone" button.
3. In the window that opens, select the downloaded .ipsw file.
4. Wait for the process to complete.

💡 Tip: If DFU mode and manual firmware didn't help, and error 4013 repeats on different computers with different cables, there is a high probability the problem is hardware-related—a faulty Lightning port or controller on the device itself. In this case, you need to contact an authorized Apple service center.

5. Test on Another Computer and with a New User Profile

If nothing worked, the problem might be in your operating system's settings.

1. Create a new local user in Windows/macOS with administrator rights.
2. Log into this new account, install iTunes (if necessary), and try the restore.
3. If that also fails, find another computer (preferably with a different OS or a clean driver set) and repeat the procedure. This will rule out USB controller driver issues or system conflicts on your main PC.

Preventing Error 4013

To minimize the risk of error 4013 in the future:

• Use only high-quality, certified cables. The original Apple cable is the most reliable option.
• Connect directly to the computer's port. Avoid USB hubs and do not use front-panel or keyboard ports.
• Keep connectors clean. Gently clean the Lightning port on the device and USB ports on the PC from dust and dirt.
• Keep software up to date. Install the latest versions of iTunes (or macOS) and iOS.
• Make backups before major iOS updates via iCloud or iTunes.
• Disable antivirus during iTunes restore/update operations if you are confident in the firmware source.