Asus P4S8X - Manual (Page 119)

ASUS P4S8X motherboard user guide 101
6. The next screen prompts you to
flash the original BIOS to update it
with the new boot logo. Click Flash
to update the BIOS.
7. When finished, click Exit, then
reboot your computer.
Your system boots with the new
boot logo.
MyLogo ™ may not support overly complex images. If you encounter any
problems using complex images, try using a simpler image. Yo u may
also use a photo-editting software to shrink the complex image, lay it
over a one-color 640x480 pixel background, and save the image with the
background. When you use an image, it will appear smaller and centered
on the screen.
Instead of starting from ASUS Update, you may also launch ASUS
MyLogo
™ directly from the Windows Start menu to change your BIOS
boot logo. After you have modified the BIOS file with the new logo, use
the ASUS Update utility to upload the new BIOS into the EEPROM.