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09 mac pro high sierra

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    Will 10.13 Firmware for Mac Pro 5,1 Kill Yosemite Compatibility?

    Hi! Im about to take the plunge and upgrade to High Sierra. I'm running an 09' Mac Pro 4,1 that has been flashed to 5,1 and is running Yosemite 10.10.5. I have made a bootable clone drive of this Yosemite system, because there are some apps I may need to use that are not compatible with High...
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