go to correct website,
download software for update,
read instructions provided by the manufacturer,
follow instructions carefully, flash the sucker, and reboot,
you should be done.
it is much the same as any firmware update (like when you update your bios), you got to be carefull, don't touch anything at all until the update is finished.
I have flashed burners and modems and bios's, never had a problem, NEVER. knock on wood.
baldy