Thank you for contacting the Intel Embedded Community.
In case that you refer to the Intel(R) Desktop Board DG33FB BIOS, you may find it at the https://downloadcenter.intel.com/product/50377/Intel-Desktop-Board-DG33FB Downloads for Intel® Desktop Board DG33FB web site.
All the information related to this board can be found at the http://www.intel.com/p/en_US/support/highlights/dsktpboards/dg33fb Support for the Intel® Desktop Board DG33FB web site.
In case that you will have more questions related to this device, please feel to address them through the http://www.intel.com/p/en_US/support/contactsupport?group=server Contact Support web site to receive the further answers to them.
Please let us know if this information is useful to you.