I am not from Intel, and I don't know why they think unplug from AC power is related to your question. I think what you want to know is called the Power Button Menu described around page 55 of the technical manual. From power-off state, you hold the power button down for some very specific amount of time (I think 3-4 seconds) - not longer and not shorter. Then you should get a text menu where you should be able to press F2 (assuming your keyboard is compatible, for example if you previously had success with F2 but your latest boot method is too fast).
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