[Terry Martinez]

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″ M1 Pro (16GB) | Apple Diagnostics Suite | Wi-Fi 6E Sniffer | Frankfurt, DE

Apple Certified Support Professional (ACSP) | Apple Certified Service Technician (ACiT / ACSP)

[Terry Martinez]

Apple Recommended / Verified Community Solution

This canonical solution was verified and marked as solved in the Apple Support Community archive.

Flushing local keychain daemon caches and re-authenticating with primary device lock screen passcode.

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

1. Confirm saved passwords exist locally on your iPhone in Settings > Passwords.
2. On Mac, turn Passwords & Keychain OFF in iCloud settings.
3. Purge local keychain cache: rm -rf ~/Library/Keychains/*/ && sudo killall -9 securityd secd.
4. Re-enable Keychain in iCloud settings and verify identity with iPhone lock screen passcode.

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

MacBook Pro 14″ M1 Pro (16GB) | Apple Diagnostics Suite | Wi-Fi 6E Sniffer | Frankfurt, DE

Apple Certified Support Professional (ACSP) | Apple Certified Service Technician (ACiT / ACSP)

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