Firstly you need to install a dashboard. Use slayers to install a dashboard. Then if you want to reflash your bios there are a few ways but there is really no need .You already have a working bios !
you can use Flash fxp to edit the evox.ini file and add the commands needed to flash from evox.
Add this line under all the other Flash= lines
Flash = 0xbf52,"SST 49LF020A",0x40000
Add this line under the System Management section
Item "Flash BIOS",ID_Flash_Bios
Or forget about using evox and just burn eurasia to a cdrw and use that to flash your bios. Please note eurasia needs the bios to be the correct size in this case 256k. Evox will auto resize for you !
HackDaBox !