hmm, I don't know anything about guiminer, I use CGminer. You can get the gist of reflashing here https://forum.litecoin.net/index.php/topic,2963.0.html I don't know what bios you would need. Before you flash things, is there a guide to setup guiminer somewhere? CGminer has the Scrypt-readme text file that comes with the program to get you started. It took me about 2 hours to dial the cards in to their max before flashing.