He can open it up and check the connections for the battery and the charging port, a connection could have been knocked loose. He could also connect a battery to the phone and extract the data or take the battery out and charge it with a battery charger you can pick up on Amazon for 20 dollars
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do you have to return the phone? If so will you get in trouble if you open the phone? You can have a repair shop take the back cover off and charge the battery and get the data.