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[Solved] Restore Error {err} in Finder / iTunes on iOS 17.6: Diagnostic steps and permanent fix

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Home › Forums › iPhone & iOS Help Desk › [Solved] Restore Error {err} in Finder / iTunes on iOS 17.6: Diagnostic steps and permanent fix

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  • November 15, 2026 at 2:03 am #17140
    Betty Herrera
    Community Contributor
    Diagnostic Hardware Specs: iPhone 16 Pro Max | OS Version: iOS 17.6 | Archive Source: Apple Support Community #256788729

    I am running into a persistent issue on my iPhone 16 Pro Max running iOS 17.6.
    Whenever the machine encounters NAND communication timeout during early bootloader initialization, the following diagnostic log appears in Console:

    AOSKit: [Restore] Device state transition failed: result code 4013 during secure boot image verification

    I verified that hardware connections are intact and tested across different power sources. What is the verified diagnostic procedure to permanently eliminate this symptom?

    Mac Pro M2 Ultra | Dual Pro Display XDR | Blackmagic UltraStudio 4K Mini | Calgary, AB
    Final Cut Pro / DaVinci Colorist & Editor | "Verified Apple Discussions Archive"
    November 15, 2026 at 2:03 am #17141
    David Weber
    Community Contributor
    Apple Recommended / Verified Community Solution
    This canonical solution was verified and marked as solved in the Apple Support Community archive.

    Direct Thunderbolt connection, forcing true DFU mode, and executing an in-place software update or Configurator revive.

    Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:

    1. Never select ‘Restore’ if data is unbacked-up; always select Update.
    2. Use an authentic Apple USB-C 60W/240W cable connected directly to Mac ports (no hubs).
    3. Enter true black-screen DFU mode and execute an Apple Configurator Revive Device pass.

    Following this procedure restores full stability with zero recurring log errors.

    MacBook Pro 14″ M4 (24GB) | iPad Air M2 | Keychron Q1 Pro | Kyoto, JP
    Apple Certified Support Professional (ACSP) | Computer Science & Machine Learning Student
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