If you get into the BIOS, it's on the right-hand side under the bottom option at the end of the ID string
FWIW, the latest version is 16 but the NF-S 2.0 I got from NewEgg in June was on version 14, all the way from March. At least it was easy enough to fix.. Abit's got a windows-based flash utility that worked just fine for me in XP.