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How to Upgrade the Firmware of a 2009 Mac Pro 4,1

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Unless you have a compelling reason otherwise, you'll want to reenable SIP. Once again, you'll have to go into Recovery Mode just like you did before and open the Terminal.

Enter the following command

csrutil enable

Reboot the machine and let it load to the desktop. Open a new terminal window and enter the following command to check the status of SIP

csrutil status

If all was successful, you should get a line back that reads:

System Integrity Protection status: enabled.

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