Experienced modders know: always back up the original OEM logo before making changes. Having a ZIP archive of the original BMP(s) allows you to restore the factory boot screen if something goes wrong.

ASUS’s BIOS utility (EZ Flash / MyLogo) requires an uncompressed with these specs:

Here’s a professional, clear post suitable for a tech forum, blog, or Reddit (e.g., r/ASUS, r/techsupport):