No problem.
Here is the ASUS support page for the utility and
this should link you to the latest BIOS files for you motherboard.
It looks like version 1001 is the latest official release for your board, not a beta.
If you don't have a floppy drive you can make it work using a USB flash stick.
Format and follow the directions as if it were a floppy disk, then boot into your BIOS.
This is coming out of my P5K Deluxe BIOS so it might not be exactly the same in yours.
Go to the advanced tab and select
USB Configuration.
At the bottom you will see
USB Mass Storage Device Configuration, open it and switch
Emulation Type to
Floppy or
Forced FDD (I haven't tried it myself so use which ever works).
Go to the boot menu and make sure the first boot device is set to floppy drive and set the second is set to the flash stick just for good measure.
Exit & save changes and it *should* treat your flash as a floppy.
From this point it should work the same as in the guide.
Wish I had time to test it myself but it's already 1:30 here and I have to work in the morning.