That seems about right. AMD 970 chipset, so that's a modern chipset, and AMD sticks to its features, so there isn't really a need for a more recent BIOS. Other than that, Asus is also notorious for not supplying BIOS updates, but in this case it's not important. On AMD K-series, anything after 2009 is a good BIOS, because they've been implementing the Opteron Gen3 standard for everything since about 2009 or so, and it just always works just fine.