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Disable SIP
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You'll need to disable System Integrity Protection (SIP) in order to flash the new firmware.
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Restart your Mac Pro and hold cmd+r to boot into the recovery partition on your boot drive.
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Once in Recovery Mode, go to the Utilities menu at the top of the screen and click Terminal
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Enter the following command:
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csrutil disable
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Hit return and restart your Mac Pro as normal.
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