Mac Pro EFI Firmware 1.5 NOT installing (Yes, I RTFM)

Starting a new topic as the other one was marked 'SOLVED'.
MacPro5,1 2.8 Quad.
Firmware 1.5 does install before shutdown, but the progress bar doesn't appear when holding the power button. After the loud firmware beep, the chime follows immediately and the machine boots up. Software Update keeps prompting to do the update again.
Have been on the phone with Applecare for over an hour, who have no idea why this thing doesn't work...
Troubleshooting done so far:
-Zapped PRAM, Reset SMC
-Downloaded standalone installer instead of Software Update
-Freshly installed 10.6.4 on FW800 disk and tried installing from that install
-Disconnected all peripherals including 27" LED Cinema Display
-Downloaded standalone installer on another network
There is no progress bar appearing and the bootrom stays on version MP51.007F.B01.
Strange: in the Utilities folder there is a Mac Pro EFI Firmware updater app that displays a "file may be incomplete or damaged" error when trying to start it.
Applecare had no idea, second line support puzzled as well...
Any ideas ?

When you click OK for install, it'll do the little updater window, tell you it's optimizing, then shut down your computer.
You're in front of a shut-down MP 2010. You need to click *AND HOLD* the power button for a few seconds. It'll flash a few times, make a different tone and then you'll see the updater bar.
You cannot just power it up, you must click and hold until the little white power indicator light flashes.
Welcome to MP51.007F.B03
p.s., Why it drops the file Mac Pro EFI Firmware.app which is "damaged" etc, into /Apps/Util/ I dunno. It does that for me too, but firmware is updated. You should be able to hit Software Update now and not keep seeing the EFI update show up.
If you're clicking AND holding the power button AND see the white light flash multiple times (it takes a few seconds, keep holding down the power button), and it still doesn't work... then I dunno.

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