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![]() ![]() I've never been able to boot a pre-09 Mac from USB & I've tried pretty much everything the interwebz has to offer in that regard - though my oldest Mac Pro was an Early 08 so I've never needed to force it quite so hard, as I don't need to push the firmware upgrade too. I think whichever way you force the newer firmware, you're going to have to have the installer on HD or DVD.
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