Efi bootloader for 32-bit efi macs and osx mavericks.

Hello. It’s a bit old, but still awesome news. An osx bootloader for old macs with 64-bit cpu but 32-bit efi (like macpro 1,1/2,1). Can boot osx mavericks, supports efi in osx, so nvram, firevault and other things depending on efi runtime calls will work.

Check it out here


  1. Rominator
    January 15th, 2014 | 3:16 am

    This is really and truly one of the BIGGEST developments for earlier Macs. The Mac Pros are the big winners as many iMac/MBs, etc are stuck with unsupported GPUs that have no 64bit kexts.

    Hmm….gives you a glimpse into future for nMP.

  2. a Martin
    January 15th, 2014 | 10:49 am

    I’ve tried it and it works very well, except that on the MacPro1,1 I’ve installed it on OS X seems to think there are two displays connected (one ”ghost monitor”) although I only have one. Any ideas on how to fix that?

    Anyway, It’s really cool that these old but still very capable Macs can run the latest OS X!§

  3. a Martin
    January 15th, 2014 | 10:52 am


    What do you mean by ?gives you a glimpse into the future for new Mac Pro??

  4. Rominator
    January 15th, 2014 | 11:09 am

    Having an easily replaced GPU allows these older MPs to run latest OS effortlessly.

    The iMacs and MBs can do everything but the GPU stops them in many cases.

    The nMP will be in same boat in 5-7 years.

  5. LoLL
    January 15th, 2014 | 1:52 pm

    Yes, this loader avoids chamaleon use with modded DSDT and sleep/sound/pstate problems.
    So very good news for MacPro 2006-2007 users.

    Asso, it seems that 7300GT is usable under mavericks now ! (reported in forum link)

  6. a Martin
    January 15th, 2014 | 3:36 pm


    Not so sure about that. It seems one might be able to upgrade the GPU in the new Mac Pro. The new Mac Pro is more modular than one might think.

  7. rominator
    January 16th, 2014 | 5:59 am

    yes, nobody ever said it was welded in there.

    removing it is easy…question is what are you going to replace it with?

    Early iMacs can only upgrade to other GPUs released at same time, so no fix.

    Upgrade “from” and upgrade “to” are two different abilities.

    Or do you believe that Apple will keep using same exact connector and form factor for 5 years?

  8. a Martin
    January 16th, 2014 | 11:22 am


    Okay, I get your point. 🙂 I guess we have to wait and see.

  9. a Martin
    January 16th, 2014 | 11:25 am

    But I think it’s reasonable that the at least the same form factor (maybe with different internal structure) will be used for five years. If it turns out to be working well that is. The PowerMac G5 / Mac Pro had almost the same form factor for 10 years.

  10. Shadowself
    January 16th, 2014 | 3:29 pm

    @Rominator & Martin,

    I’d expect Apple to keep the same form factor and electrical interfaces for at least a couple generations.

    However, with Apple being the only company doing this form factor (and it is unlikely that any third party will produce such cards independently as the market is likely too small to recover non recurring design costs) the question likely becomes, “With future generations of the MacPro will Apple offer those next and subsequent generation cards for sale independent of purchasing a new MacPro?”

    While it has happened before, it is rare for Apple to sell GPU cards separately from the main box.

    As Martin says, “I guess we have to wait and see.”

  11. worf2
    May 31st, 2014 | 5:48 pm

    it a bit old as well but there are many 64 bit kexts in the 10.6.2 update for older macs.

  12. Peter
    March 10th, 2016 | 12:00 pm

    Hello, i`m new in Apple PC, have an old Mac Book 1.1 and need Mavericks 32 bit for Download,olease help me,its be wunderfull, please send answer to

    my home is Germany


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