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Dolphin.dyl(TM) Pre-programmed BIOS EFI Firmware Chip For MacBook Pro A1286 2012 820-3330-BWhat skill you need : 1. disassemble the laptop 2. find the chip(we will offer the picture showing the location of the BIOS EFI Firmware Chip and Logic board model number) 3. replace the chip(requires skill to desolder and solder by using a fine-tipped solder..