Apple iPhone Error Code 55: How to Fix It

Easy 20-30 minutes Medium Severity Verified June 2026
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Error Code
55
Brand
Apple iPhone
Product Type
mobile
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
20-30 minutes
iTunes Error 55 typically appears during a restore or update on an iPhone, indicating a 'preflight check failure.' This means iTunes cannot complete the restore process, often due to software conflicts, USB issues, or security software interference.
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Tools You'll Need

How to Fix Error Code 55

  1. Update iTunes and macOS/Windows

  2. Disable Security Software

    Be careful when disabling security software; ensure your computer is on a trusted network.

  3. Check USB Connection and Port

  4. Put iPhone in Recovery Mode and Restore

    This will erase all data on your iPhone. Ensure you have a backup if possible.

  5. Use Third-Party iOS Repair Tools (Alternative)

    Research the tool thoroughly to avoid malware; official Apple support is recommended first.
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When to Call a Professional

If none of the steps resolve error 55 and you're unable to restore your iPhone, contact Apple Support or visit an Apple Store. It could indicate a hardware issue, especially if you've tried different cables and computers.

Frequently Asked Questions

What causes iTunes error 55?
Error 55 occurs when the restore preflight check fails. Common causes include outdated iTunes, security software interference, faulty USB cables/ports, or corrupted iOS files.
Will I lose my data if I restore my iPhone to fix error 55?
Yes, using the 'Restore' option in recovery mode erases all data. If you have a backup, you can restore it afterward. If not, try third-party tools that claim to preserve data, but results vary.
Does error 55 mean my iPhone is broken?
Not necessarily. It is usually a software or connection issue. Only if hardware is damaged (e.g., logic board) would it be broken. Professional diagnosis is needed if software fixes fail.
Can I fix error 55 without a computer?
No, because the error occurs during a computer-based restore (iTunes/Finder). You need a computer to perform the steps listed above.
Is error 55 specific to certain iPhone models?
Error 55 can occur on any iPhone model when using iTunes. It is not model-specific.

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