PM G5 fimware update problem (5.1.8f7)

in Genius Bar edited January 2014
Help me folks, please.

So I tried to update the firmware of my DP 2.5 G5 as described in the updater: save and quit all apps, shut-down from updater, press and hold the power-button and wait until I hear sound or powerbutton light flashes. Very easy.

But instead of getting a sound, progess-bar or a flashing light by holding the power button, it starts up in open-firmware mode without updating this damn firmware ... every time.

Anyone has an idea what the problem could be or is?

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