I received my new Bios chip today, all flashed to the latest available from Abit. I put it in and I still get the post error of 9.0. No amount of CMOS resetting / removing the battery etc. will make any difference. Ouch, more money lost. Not sure what is next. No point swapping the MB for the same thing through NewEgg. They pretty much told me they won't guarantee a particular bios rev will be shipped. I could swap for another brand like Asus, or I return to newEgg and buy a MB locally with the hope of getting some support.
(And in case you were wondering, yes I did pickup my copy of HL2 today after I heard my bios chip arrived. How optimistic was that?)