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  • Ziatron Level 4 Level 4

    steve359 says:


    "Anything sold since mid-july had EFI-firmware that *ALMOST ALWAYS WITHOUT EXCEPTION* refuses to run less than Lion."



    I remain confuse, but still persistent.

  • Elite Expert of all Knowledge Level 1 Level 1

    Ziatron wrote:

      How long ago did you purchase your Mac Pro? (I miss the old days, when users would modify their own firmware.)


    These would have been purchased in October or early November. They shipped with Lion preinstalled.

    I currently own a 2008 Mac Pro (2,1) with 10.6.8


    Yeah, that should allow you to run up a drive with 10.6.8 on it that you can swap over. Or for a quick test, just swap the existing drive over.

    Why not Apple?  They have a 15 Day return policy.   When I called Apple recently the person I spoke to suggested this.

    Yes, if Apple will let you try it, then why not take advantage.

  • Elite Expert of all Knowledge Level 1 Level 1

    It's a little ambiguos to me whether Steve359 means Mac Pros, or Macs in general.


    I can tell you that we could not install Snow Leopard onto the drive in the Mac Pro, as the Mac Pro would not boot from the 10.6.3 retail disk. It might also be the case that trying to install on to the drive without repartitioning it might be a problem. I think that apple have changed something with the way their partitioning works, as I've had a couple of other issues with Lion that seem related to this.

  • FatMac>MacPro Level 5 Level 5

    Ziatron wrote:


    steve359 says:


    "Anything sold since mid-july had EFI-firmware that *ALMOST ALWAYS WITHOUT EXCEPTION* refuses to run less than Lion."



    I remain confuse, but still persistent.

    While there's nothing definitive and a lot contradictory, a number of postings indicate that it's possible to boot from a drive or partition that's running at least 10.6.4 even if the Mac Pro came with Lion installed. There's also the suggestion that where the partition came from doesn't matter; i.e., cloning a 10.6.8 partition from, say, a Mac Book would work. While that's worth a try, I wouldn't bet the farm on it since the hardware configurations are so different. I can say that the boot partition on my Mac Pro 1,1 booted successfully on the 5,1 after I cloned it onto a new HD (thank you OWC) in the 1,1 and then moved the HD to the 5,1 (one of the many charms of the Mac Pro is the incredible simplicity of adding a drive; why not take advantage of that here?). That also seems to work better than Migration Assistant and a lot better than Time Machine for carrying over your accounts and software. In any case, I would suggest that as soon as the Snow Leopard installation is up and running, that you reinstall the 10.6.8 combo update so that the installer has a chance to customize the OS for the new hardware.


    Note that all of this presumes that the original Lion install remains untouched, since if the clone-a-drive method has long term hidden booby-traps, you still have something to retreat to. It also means that you have a local drive you can use Migration Assistant with if you want to have Lion operational too. Indeed, if you're additional drive is two or three TB, you could set it up with a number of partitions at the outset, do your cloning, first booting and updating as above, then clone the factory installed Lion partition onto it and run Migration Assistant from there, leaving the factory HD untouched. And/or you could clone your now working 10.6.8 partition to another partition on the new HD, then download and run the Lion installer on it. Big drives and multiple drive slots offer all kinds of possibilities and it pays to plan ahead, because the Mac Pro is almost unique in making those possibilities a reality.

  • johnn013 Level 1 Level 1

    I had same issue with a refurbished Mac Pro (5,1 - Mid 2010) I just ordered the beginning of February.  It had no indication of what OS to expect and came preinstalled with 10.7.2 (Lion).


    In the end, after a lot of research, this is what I've discovered:


    Go to apple support and look up your specific build as Kappy mentioned --


    Mac OS X versions (builds) for computers


    If your build came originally with Snow Leopard, mine originally shipped with 10.6.4, then you can certainly do it if nothing was refurbished on the machine that made it Lion specific. 


    Write down your serial number and Boot ROM (both found under "about this Mac"), and call Apple Care or use Express Lane.


    Get someone on the phone and have them run these numbers to make sure that your refurbished machine was not altered in any way that would not allow you to install Snow Leopard.  Then you need at least the version of Snow Leopard that the machine shipped with originally.


    Since mine came with 10.6.4, I can't use the retail disk which is 10.6.3.  I told Apple to send me the original install disk 10.6.4 because they were never shipped to begin with, Lion was preinstalled.


    They are shipping me 10.6.8 disks for free.  The latest version of Snow Leopard you can find.


    So to sum all this up, look up your build, find out which OS originally came with your specific build, call Apple and have them run your serial and Boot ROM numbers to make sure you are backwards compatible, and have them ship you the original install disks with at least the minimum version for your build.


    As a warning to anyone looking to buy a refurbished Mac specifiaclly for use with Snow Leopard, there is no way to know what it will be shipped with.  Best to check out the build before you buy and call to have them send you the install disks.

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