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There will be relevant information on the website of your motherboard manufacturer or bios manufacturer. It usually involves booting from floppy or cd and running a program written by them to flash it.
Consult your manufacturer, there is not an all encompassing solution for this, and yes things can go very wrong if done improperly.
What happened during installation that signaled that you needed a bios update? I wouldn't try and flash it quite yet as you could trash the board if instructions aren't followed to the letter and it may be unnecessary.
dont worry ... just go ahead and flash it ... sometime you can save the previous copy of your bios and flash it back to it previous state if you want ...
as long as you "comply" to the warning before(most probably) you started downloading whatever stuffs that is needed for the task or during the flashing(but just before it starts to flash) ...
i used to flash with bootable floppies but your case may be different nowadays ...
My BIOS update philosophy: If it ain't broke, don't fix it.
I concur.
You can render your board useless and beyond repair if something goes wrong, for example a power outage during the flashing, or having a corrupt copy of the image you are copying. It is very different to installing an OS to a hard drive where you can simply restart the process if something goes wrong.
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