Find one more floppy and try like i said above.
One more thing, are you sure that is right bios upgrade.
I was flashing my epox board and it was shiting about like it shits to you.
It didnt wanna to save old bios, the reason was it wasnt the right bios to flash.
I was downloaded bios from europe epox site etc..., that didnt work, but when i downloaded from Epox u.s.a. it worked.
Is this the board?http://www.chaintechusa.com/tw/eng/product_spec.asp?MPSNo=13&PISNo=277