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

[Willie Mendoza]

Diagnostic Hardware Specs: iPhone 15 Pro | OS Version: iOS 17.6 | Archive Source: Apple Support Community #256790964

I am running into a persistent issue on my iPhone 15 Pro 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 9 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) | iPad Air M2 | Keychron Q1 Pro | San Jose, CA

Computer Science & Machine Learning Student | "Verified Apple Discussions Archive"

[Gregory Moreno]

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 M2 Ultra (128GB) | ASUS ProArt PA32UCG-K | OWC ThunderBay 8 | Milan, IT

Apple Certified Support Professional (ACSP) | Final Cut Pro / DaVinci Colorist & Editor

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