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How to fix an unknown error occurred (1667) − iPhone, iPad, iPod touch

What is iTunes error 1667? How to fix it?

Error 1667 appears when you try to update your iPhone, iPad, or iPod touch to the latest version, or when you try to sync files from your computer to your iOS device.

The reasons behind this error include:

  • Outdated iTunes version;
  • Antivirus software;
  • Faulty lightning cable;
  • Corrupt iTunes file
  • Malicious software (aka a virus);
  • Outdated operating system.

The solutions listed below will assist you address this error. Read them carefully, and follow them to the detail.

Select specifications which apply:

Click on this if you use an iPhone.

Click on this if you use an iPad.

Click on this if you use an iPod touch.

Click on this if you tried all the other solutions, but none of them worked.

  1. Close and reopen iTunes

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  2. Check if the USB (lightning) cable is firmly connected on both ends

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  3. Take your mobile device to a repair shop

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  4. Use an original (USB) lightning cable

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  5. Check the antivirus software

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  6. Optimize your computer

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  7. Free up space on your iOS device

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  8. Update iTunes to the latest version

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  9. Put your device into DFU mode and then restore it via iTunes

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  10. Plug the device in another USB port

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