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A1502 Macbook Pro EFI general question regarding serial number

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  • #16
    Big thanks to you MacRepairAmb.

    As I've tryed them all in the mean time, then I can complete the list:
    26: Show Medusa internal ROM 2 and 3
    27: Load Medusa Internal ROM
    28: Show Medusa ROM 3 ME Version
    29: Verify ROM 3 in Medusa
    30: TEST POWER
    above it's just ?????????

    Question when it's reading the Mac serial number of 2 differents 00165 board it's written BAD next to it WHY?

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    • #17
      Checksum is bad. That’s why you will get a “bad” messiahs by the serial number. First read and store your current efi bios. The perform mode 12. But make sure you backup the efi data before you proceed.

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