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[Solved] Restore Error {err} in Finder / iTunes on iOS 18.1: Diagnostic steps and permanent fix

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Home › Forums › iPhone & iOS Help Desk › [Solved] Restore Error {err} in Finder / iTunes on iOS 18.1: Diagnostic steps and permanent fix

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  • November 15, 2026 at 1:20 am #16460
    Christine Chen
    Certified Tech (Lvl 5)
    Diagnostic Hardware Specs: iPhone 15 Pro | OS Version: iOS 18.1 | Archive Source: Apple Support Community #256502536

    I am running into a persistent issue on my iPhone 15 Pro running iOS 18.1.
    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 16″ M3 Pro (36GB) | Studio Display | Magic Mouse & Trackpad | Seattle, WA
    Product Designer & Design Systems Lead | "Verified Apple Discussions Archive"
    November 15, 2026 at 1:20 am #16461
    Eric Stewart
    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 (32GB) | Studio Display | YubiKey 5C NFC | Porto, PT
    Apple Certified Support Professional (ACSP) | Enterprise Mac Sysadmin & Jamf Pro Architect
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