If you can get to the bios, usually it will say something while it's booting like press alt +f4 to enter bios flash utiltiy, which is the program to flash the bios. The mfg should have bios's on their site, and you'd dl it and put it on a floppy, boot up, and enter the bios flashing utility, and then flash it. If you don't know what core you got, the only way i'd know to check would be by the part number on the cpu itself or by running a program from windows(which you can't do).