What is the full story?

Are you putting this old board into a new case? Is that all?

Did this board work previously?

Even if the case leads are USB 2.0 they still fit the same internal ports as USB 1.1. The plugs and ports should be the same 10 pin with one blank.

The motherboard USB ports (rear of case) have no bearing on the internal ports.

Did the rear ports ever work?

If you need to make changes in the BIOS Setup this is not Flashing the BIOS.

Just enter BIOS Setup and check out the options. There is not much damage you can do here. You can always reset the Defaults.

I am not sure what flashing the BIOS would get you. Depends on what you are trying to do here and what all you are upgrading.

This is a fairly old board and probably has not had a BIOS upgrade in quite a while.

Version 3.7 Update Date 2002-10-22 to be exact.