how do I change the GRUB background image?

https://libreboot.org/docs/grub/index.html

Hi,

That's the one indeed. But why would you want to do such an crime ? That image is the 1st sign of freedom on your computer.

:)

According to libreboot.org, png's will do the trick:

Changing the background image in GRUB
Use cbfstool from libreboot_util, or libreboot_src/coreboot/util/cbfstool/ if you want to build from source.
$ ./cbfstool yourrom.rom remove background.png -n background.png
$ ./cbfstool yourrom.rom add -f background.png -n background.png -t raw
When you’ve done this, re-flash your ROM and you should have a new background at boot time.

https://libreboot.org/docs/grub/index.html

Thanks guys

gr55nh0rn I changed it to the image that I attached here