To change the BIOS , Will probably need a special program from the computer or BIOS manufacturer.
Look at the BIOS revision and date information displayed on system startup or check with your computer manufacturer to find out what type of BIOS you have.
Then go to the BIOS manufacturer's Web site to see if an upgrade is available. Download the upgrade and the utility program needed to install it. Sometimes the utility and update are combined in a single file to download. Copy the program, along with the BIOS update, onto a floppy disk. Restart computer with the floppy disk in the drive, and the program erases the old BIOS and writes the new one. Can find a BIOS Wizard that will check your BIOS at BIOS Upgrades.