What troubleshooting steps can I try for 'Unknown error 4013'?

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Grade: Education Subject: Support
What troubleshooting steps can I try for 'Unknown error 4013'?
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Start with a forced restart: Press and hold the power button and volume up button simultaneously for about 10-15 seconds. Then, try restoring your iPhone via iTunes or Finder. If the problem persists, consider a factory reset (see caution below).