HELP PLEASE efi downgrade

Discussion in 'Mac mini' started by lolapaloooza, Nov 7, 2012.

  1. macrumors newbie

    Joined:
    Nov 7, 2012
    #1
    Hi to all!!

    new in this forum and need your help!!

    is there a way to downgrade the mac mini efi??

    I have a 2009 mac mini and installed mountain lion..didn't like it at all..
    so..next thing I did was to install the snow leopard..but unfortunately because of the efi upgrade I cannot install it..

    so please..can somebody explain me how I can downgrade the efi??

    thank you in advance!!!
     
  2. macrumors 68040

    Joined:
    Jul 11, 2009
    #2
    The EFI update isn't what is blocking your install of Snow Leopard. What exact errors are you getting?
     
  3. thread starter macrumors newbie

    Joined:
    Nov 7, 2012
    #3
    hi!!
    thank you for the reply!!!

    here is the exact problem..
    when I turn the mac on and hold the alt button there system does not recognise the snow leopard dvd..
    but the main problem is that since I installed mountain lion is that the system when I hit alt while it starts up does not recognise the ''acronis'' boot cd.acronis is a program that makes an image of your hdd.
    so I figured out that since the mountain lion installation which comes with an efi upgrade,the boot of alternative bootable cd or usb devices except m.l. is not possible.

    that is why I want to downgrade it... :(
     
  4. macrumors 6502

    Joined:
    Jul 5, 2011
    Location:
    the corner of Fire and Brimstone
    #4
    By your explanation, the reason you want to downgrade the EFI is so you can make an image of your HDD? There are several utilities that are very capable of this, the most obvious of which is Disk Utility which is part of the Apple OS.

    If this is incorrect can you explain?
     
  5. macrumors 68040

    Joined:
    Jul 11, 2009
    #5
    That's not the case. I'd suspect that since you have 2 DVDs which won't boot the computer that your DVD drive is faulty.
     
  6. thread starter macrumors newbie

    Joined:
    Nov 7, 2012
    #6
    thanx for the reply!!

    that is correct!!BUT!!the problem is that I have installed windows 7 right now..and the only way to use the most compatible program that makes an image is acronis..I used this program and it was running very smooth..until the m.l. upgrade..which brought the efi upgrade to...

    that's why I want to downgrade it..

    is there a way???
     
  7. macrumors 68040

    Joined:
    Jul 11, 2009
    #7
    There is no way to backdate the EFI, but again, this is not the source of your inability to use an older operating system.
     

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