Currently you are using the latest BIOS available, but hopefully a newer BIOS update will be released soon.
I'm sorry for your inconvenience on this matter.
I had a similar problem with the fans when I updated the BIOS on my DZ77BH board. It wasn't until I went it into the classic mode BIOS page and did a reset to defaults did the fans start behaving. Might be worth trying that although you will need to set back anyother changes you made.
Latest BIOS (0071) fixes this issue!