A BIOS is supposed to be a permanent instructions that can be overwritten due to today's technology. But it's not an easy overwrite because it's a hardware overwrite. A BIOS can only be flashed so many times. This is getting a program to overwrite the BIOS. If the program fails to execute properly, the Graphics board is no more. The BIOS stands for Basic Input Outpu System. Without it nothing would work since it is the one who starts up the system. Flashing is a very risky duty because you are overwriting hardware, meaning that you are actually burning in transistors and such. Very danerous.