How to get into CRISIS RECOVERY mode to reflash BIOS?

Hi..
I have a ProBook 4710s andmy BIOS is bricked, blank screen with flashing capslock, which means Authentication BIOS (failed).
And I can't find the key combinations to put my notebook into the crisis recovery mode to reflash the BIOS.
Does anybody know the combination???  (I've tried <Win>+ <B>, <Func>+<B>, <Win>+<Esc>, <Func>+<Esc>... and nothing)
HELP!!!! PLEASE!!!

I found the document confirming this, see bios authentication failure on this page
http://h10025.www1.hp.com/ewfrf/wc/document?lc=en&​dlc=en&cc=us&docname=c01443366#N1231

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