No need to flash the BIOS typically, but if you are going to do it, definitely flash from a clean DOS environment. I always use the "Driver Free Disk For BIOS Flashing" disk available from bootdisk.com and never had a flash failure -- just in case, always save your current BIOS before you flash the new one.
I just flashed my Gigabyte GA-P35-DS3R (rev 1.0) from the F6 to F9 BIOS without issue.
BTW, for your motherboard, the rev. 2.0 is NOT a BIOS but a new motherboard revision. The BIOS revisions are labeled F1, F2, F3, F5, F6, and the latest is F7 released Nov 29, 07. See
http://www.gigabyte-usa.com/Su...el.aspx?ProductID=2560. For my board, the BIOS are the same for both rev 1.0 and 2.0 of the motherboard but no guarantee the same applies to yours, so make sure you know if you have a 1.0 or 2.0 board first.