Quick Summary
Error 4005 on iPhone typically indicates a communication problem during the restore or update process, often linked to USB connectivity issues or software conflicts. This error usually prevents the device from completing the restore or update and can leave the device in recovery mode.
Common Causes
- Faulty USB Connection: A loose, damaged, or incompatible USB cable or port can interrupt the data flow during the restore process causing error 4005.
- Outdated or Corrupted iTunes/Finder: An outdated or corrupted installation of iTunes (on older macOS or Windows) or Finder (on newer macOS) can lead to communication errors during restore.
- Security Software Interference: Antivirus software or firewalls might block the connection between your computer and the Apple servers, preventing the restore process from completing successfully.
- Hardware Issues: In rarer cases, a hardware problem with the iPhone itself, such as damaged logic board components, can lead to restore errors.
Step-by-Step Fixes
Method 1: Check USB Connection
Step 1: Try a different USB port on your computer. Avoid using USB hubs or extension cables; connect directly to a USB port on the computer.
Step 2: Use a different, known-good Apple-certified USB cable. Ensure the cable is not damaged.
Step 3: Restart your computer and iPhone. This refreshes the system and clears potential temporary glitches.
Method 2: Update or Reinstall iTunes/Finder
Step 1: Update iTunes (Windows or older macOS) or macOS to the latest version. On macOS, go to System Preferences -> Software Update.
Step 2: If updating doesn't work, completely uninstall iTunes (on Windows) and then reinstall the latest version from the Apple website.
Step 3: For newer macOS remove the device cache. Open Finder, hold the Option key and click Go in the menu bar, the select Library, then go to Devices folder and delete content inside it.
Method 3: Disable Security Software Temporarily
Step 1: Temporarily disable your antivirus software and firewall.
Step 2: Attempt the restore process again. Remember to re-enable your security software after troubleshooting.
Method 4: Force Restart iPhone
Step 1: Press and quickly release the volume up button.
Step 2: Press and quickly release the volume down button.
Step 3: Press and hold the side button. When the Apple logo appears, release the side button.
Step 4: After the restart attempt the restore process again.
Method 5: DFU Restore
Step 1: Put your iPhone into DFU (Device Firmware Update) mode. The process varies by iPhone model; search online for 'DFU mode [your iPhone model]' for specific instructions. For example, search 'DFU mode iPhone 8'.
Step 2: Once in DFU mode, iTunes/Finder should detect your iPhone in recovery mode and prompt you to restore. Follow the on-screen instructions.
Warning: DFU restore will erase all data on your device. This should be used only if other methods have failed.