F11 and F12a here if you need them >>>>
GIGABYTE - Support - Motherboard - BIOS - GA-P35C-DS3R (rev. 2.1)
I would say it is likely more to due with the daily site changes or something else since They are still listed on a few Gigabyte sites. They are both however pulled from the Taiwan page, so who knows?
Maybe they are about to publish F12-13 final or something?