Firmware Downgrade to MP51.007F.B03 possible?

Discussion in 'Mac Pro' started by TzunamiOSX, Dec 5, 2018.

  1. TzunamiOSX macrumors 6502

    Joined:
    Oct 4, 2009
    Location:
    Germany
    #1
  2. chrfr macrumors 604

    Joined:
    Jul 11, 2009
    #2
    Nvidia's drivers have had glitches and artifacts going back to well before that firmware update. It's unlikely backdating will resolve it.
     
  3. TzunamiOSX thread starter macrumors 6502

    Joined:
    Oct 4, 2009
    Location:
    Germany
    #3
    I was on El Capitan with MP51.007F.B03 Firmware without glitches

    After update the firmware to MP51_0089_00B (update needed for HS) and then to 140.0.0.0 i have glitches on exact the same El Capitan System.
     
  4. tsialex macrumors 603

    tsialex

    Joined:
    Jun 13, 2016
    Location:
    Brazil
    #4
    TITAN problems? If so, it's not the firmware but the NVRAM.

    The only way to downgrade a Mac Pro firmware after you flash 138.0.0.0.0/140.0.0.0 is reconstructing the BootROM.

    BTW, I can reconstruct any firmware after the intermediate files are created.
     
  5. TzunamiOSX thread starter macrumors 6502

    Joined:
    Oct 4, 2009
    Location:
    Germany
    #5
    Hardware? I have resetted the NVRAM so many Times.

    Can you Help me, and what do you need? ^^
     
  6. tsialex macrumors 603

    tsialex

    Joined:
    Jun 13, 2016
    Location:
    Brazil
    #6
    The problem is into the non user accessible part of the NVRAM volume. I'll PM instructions.
     

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5 December 5, 2018