I agree, but to give you more of an idea...
To flash a BIOS essentially rewrites all the DATA stored on it and not only do you have to be able to boot to a flash drive, which you have to make yourself (as most dont have floppy anymore)
you need the flash program which is propriatory to the BIOS used phoenix for example is phlash.
the code needs to be written specifically for the chip, and you also need the original BIOS file to be flashed first, before a newer one is used.
If HP have released BIOS updates then fine, use that but it wont include any additional OC options in it, as this invalidates the warranty
I write my own BIOS flash mods for my servers, and I am telling you I would not recommend what you are trying to do