Mac Pro EFI Firmware Update 1.1 Not installing after restart

I've been trying to get this Firmware update installed for a month now, but every time I restart it just comes back to the screen with instructions. I've tried holding the power button down until after it blinks, until the beep, while it's blinking, after the beep- and nothing seems to work so I just hit cancel and give up on the update. I've seen others have had this problem but responses say just to hold it down for 5 seconds, but that doesn't work. Are there any other solutions?

One solution might be that the firmware update is for a MacPro and you show having a G5.

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