Not bios, it's a firmware update, and it will erase your ssd. I recommend copying your important files first.
This worked for my Nova 2 SATA II SSD (maufacture number: CSSD-V60GB2), which used the Phison S5 controller. Please double-check your controller, etc, and use it at your own risk. I can say that I almost gave-up and was going to use my drive as paperweight because of the slow-down, stuttering problems--totally runs fine now.
Here you go: http://www.mydigitaldiscount.com/...pdate.html
holy cow, that made a huge difference. attaching pics. Left is before. Right is after.
now I can also tell the difference. Before it was slow for everything, and now it's smooth...thanks a lot! I have two drives, will see if I have to also do the other one