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[Solved] iPhone 16 Pro Max Restore Error {err} in Finder / iTunes (iOS 17.6) – Verified Troubleshooting

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Home › Forums › iPhone & iOS Help Desk › [Solved] iPhone 16 Pro Max Restore Error {err} in Finder / iTunes (iOS 17.6) – Verified Troubleshooting

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  • November 14, 2026 at 10:29 pm #13519
    Samantha Moore
    Community Contributor
    Diagnostic Hardware Specs: iPhone 16 Pro Max | OS Version: iOS 17.6 | Archive Source: Apple Support Community #256187694

    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 3194 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?

    MacBook Pro 14″ M4 (24GB) | DJI Mic 2 | Anker Prime 27,650mAh Bank | Rome, IT
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    November 14, 2026 at 10:29 pm #13520
    Matthew Krueger
    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.

    Mac Studio M1 Ultra (64GB) | BenQ SW321C | Final Cut Pro 11 | Los Angeles, CA
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