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820-3437 No Serial # showing

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  • #31
    It would be easier for me to just replace the whole BIOS and Change the serial #. is there ANY difference? I'm still a little new at this and am not sure where to copy the Fsys block to.

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    • #32
      Yes there is a huge difference! You cannot just swap the chip lol the ME region has to be good and the FSYS block. If you are unable to do so, I'm sure people on here would be more than happy to help you fix the BIOS dump

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      • #33
        You said to have working BIOS dumpped from other board, with correct Fsys area.
        Upload that file and post the serial number which you want to put in.

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        • #34
          Can I just attach it here?

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          • #35
            NO.
            Do not attach directly on the forum any Apple schematic, boardview, or BIOS...

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            • #36
              You said upload it, can you please be more specific?

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              • #37
                Google Drive is mostly used here...

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                • #38
                  So I got a copy of a BIOS from a working machine, copied it to my Medusa 2, wrote it to the machine missing the serial without changing the serial number and the machiine worked. Then I took the same dump, change the password to the password of the "broken" machine, then had the medusa fix the checksum and clean the ME. The damned computer would turn on but the screen would not come on. I could see the fan spin and how much current it was drawing but no "bong" and no image. So just to check that I didn't brick the computer I put the original BIOS back on and the machine is now back to working as normal without a serial number. So weird how by putting a BIOS copy from a known working machine into this machine would make it work and show a serial number, yet all I did was change the serial number from the same dump and fix the checksum and it stopped working. I also must note that I did a PRAM reset too.
                  Last edited by tlough75; 4 weeks ago.

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                  • #39
                    I ran out of time and it was late so I will have to play with it again tonight.

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                    • #40
                      I just don't get it. I can copy the BIOS from another machine to the broken one and it will work. But if I try to change the serial number on the same dump, fix the Fsys and clean the ME the computer will come on but the screen will not fire up. I am obviously missing something or a step.

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                      • #41
                        Did you check if the end of BIOS file wasn't altered after serial number changed?
                        Be sure the file has the same size.

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                        • #42
                          Not I didn't check the end of the file, I didn't know how to do that. I did compare the file size however and they were Identical.

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