Looking at its support page I also see an 0804 bios so did you try it too? Sometimes bios updates are better left alone and if it isn't broke don't fix it. If you haven't tried the 0804 you might if you want a more recent firmware otherwise if everything works then I'd leave well enough alone.
I've broken things before with a bios update that forced me to roll back to an older version that better suited my hardware.
https://www.asus.com/us/Motherboards/ROG-STRIX-X470-I-GAMING/HelpDesk_Download/
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