Original post by: douglasw ,
Download: 1. Download Mac Pro 2009-2010 Firmware tool http://forum.netkas.org/index.php?topic=852.0 2. Download firmware for Mac Pro 5.1 (MacProEFIUpdate.dmg) from Apple Disable System Integrity Protection: 3. Restart your 2009 Mac Pro holding Command + R (you will restart into Recovery Mode) 4. In Recovery mode, click on "Utilities" and select Terminal 5. In Terminal, type csrutil disable 6. Press Return 7. Restart Mac Pro Run Updater: 8. Once restarted, Double click (mount) MacProEFIUpdate.dmg. Drag onto your desktop the MacProEFIUpdate.pkg from the mounted dmg. 9. Drag the Mac Pro 2009-2010 Firmware Tool.app onto your desktop. Once it is mounted on desktop, run Mac Pro 2009-2010 Firmware tool. 10. Shut down Mac pro. 11. Once shut down, hold the Power Button until you hear a tone, and let go. Your computer will now upgrade firmware. Last steps. Enable System Integrity Protection: as per original list. Done!!