My Mac Pro is a 2009 4,1, the current Boot Rom is MP41.0081.B07, it has the Nvidia GeForce GT 120 card that came with it and the internal hard drive in bay 1 has Yosemite 10.10.5. I've been trying to do the firmware upgrade using the instructions from netkas.org and reading other users posts and comments here but the Firmware Tool is not working. This is what is happening: after the Firmware Tool creates the RamDisk, I shut down the Mac Pro, reboot and hold down the power button, but instead my Mac Pro shuts down when holding down the power button. I hear the startup sound but as soon as I press and hold the power button my Mac Pro shuts down. When I press the power button without holding it down it boots normally to the desktop. This is not working. Unless I'm doing it wrong, I may have to take it to a local shop and pay someone to do the firmware update. I would appreciate any help or suggestions. Thanks.