Reply To: Finder Error 9 mid-restore on iPhone 15 Pro using third-party Thunderbolt cable
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Liam O’ConnorError 9 during restore indicates a data communication failure; a charging-only USB-C cable lacks the data lines required for DFU/Recovery mode communication, which would cause this exact error regardless of PD wattage support.
Use a certified Thunderbolt 3/4 or USB 3.x cable with full data pins (not charging-only), ensure both ports are debris-free, and if the issue persists, attempt the restore from a different Mac or Windows PC with iTunes to isolate the host.