Reply To: Finder Error 9 mid-restore on iPhone 15 Pro using third-party Thunderbolt cable
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Hannah Brooks– Error 9 during restore almost always indicates a data-communication failure; a charging-only USB-C cable (even 240W PD) lacks the data lines required for Finder to communicate with the iPhone in Recovery/DFU mode.
– Switch to a genuine Apple USB-C cable or a certified Thunderbolt 3/4 / USB 3.x cable that explicitly supports data transfer, then retry the restore — preferably after putting the iPhone into DFU mode and ensuring macOS is up to date.