16:9 boot screen

Nope -- the boot screen uses the lowest possible resolution so that it will show regardless of monitor, graphics card, video system, or TV being used. It's basically "failsafe" mode.

from a thread at microsoft forum, but maybe the below might either help/or explain further, many ways to change the picture but not the resolution

https://forums.tomshardware.com/threads/changing-boot-splash-screen.2743800/

https://superuser.com/questions/116507/how-can-i-change-my-bios-splashscreen

BTW: why do you want to change it?
 
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