Why iPhone 7 Plus Restore Error 9
i try other computer ,other cable still same problem
This fault is usually caused by hardware issue usually due to the baseband chip (Specifically the Baseband Power chip).
To get this fixed you’ll need to take the phone to a reputable repair shop that does board-level repairs / microsoldering to fix the bad connection under the chip.
This happens because of a design flaw on the iPhone 7 which previous iPhones can exhibit the same symptoms (mostly dating back to the iPhone 6+) where the phone bends too easily making the board get damaged over time when the housing gets bent / pressure applied on it.
More info on the baseband issue for iPhone 7 here:
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