most motherboards today come with software that will flash the bios for you, but if they dont you will have to go to the motherboard makers website and download the updated bios and save it to a floppy and boot from the floppy and flash it that way.
and yes your processor will work before the flash but it will only be recoginized as a single core processor...so you gotta flash the bios for the benifits of a dual core
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