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The Early 2009 Mac Pro—also known as the Mac Pro 4,1—introduced Intel's Nehalem architecture to Apple's line of professional desktop computers in March 2009. The Mac Pro 5,1 used the same interior design but received further CPU updates in 2010 and 2012.

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How to upgrade Firmware on Mac Pro 2009 with El Capitan

It used to be possible to upgrade the firmware of a Mac Pro 4.1

to 5.1. Nowadays when I try to open the firmware upgrade package .It tells me not supported on my computer. Is there anyway of overcoming this.

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Perhaps that you can manually download the file from this web page : https://support.apple.com/en-us/HT201518

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No this is the same software I downloaded it won't open on my computer

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