Official News from Gigabyte :
Description of S3 F7/DS3 F9/DS4 F7/DQ6 F8 now Updated
Update CPU ID
FSB 1333 MHz support for rev 3.3 only
we have confirmed with our product manager that "FSB 1333 MHz support" this is only for PCB 3.3 or newer. Therefore, your M/B does not support with FSB1333MHz. This issue already forward to the related department and will revise the information on our web site. Sorry for the inconvenience.

By the way, so far, our engineer is trying to release BIOS to support with using USB flash disk. However, it is not yet available for all models. If you cannot use it, then we will suggest you to use floppy disk with Q-Flash tool or @BIOS tool in Windows