DO NOT USE @BIOS!!
This cannot be stressed enough. I cannot recommend using it AT ALL with all other available options
I have seen many Boards killed (IE: Bricked, that is your motherboard is now a brick and you will have to RMA your board) by using @BIOS. I would guess that more then 90% of RMA's due to a bad flash, were because of @BIOS alone.
Yes it may work for you once or twice but if you keep using it you will find out the hard way it is not a good idea. Windows based flashing has always been looked down on and likely will never be a accepted or recommended method to flash a BIOS
A few @BIOS "Bad flash" notes will be below
Now that the Much needed warning is out of the way, onto the subject at hand