How to Fix iPhone Error 4013 during Update/Restore in 2026

Error 4013 is often a hardware-software communication issue.

1. Change the Cable: Use an original Apple MFi cable.
2. Update iTunes/Finder: Ensure you have the latest version on your Mac/PC.
3. System Repair Tool: If the error persists, use a specialized tool like Tenorshare ReiBoot to fix the iOS core without deleting data.