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

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Re-enable SIP
  • 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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