Do you mean "image" as in the binary blob containing u-boot or as in the literal mobian logo you see on boot?
In the first case I think @devrtz has an excellent answer, but on the off chance you meant the logo it's in /usr/share/plymouth/themes/mobian/ . I would recommend making a copy of the theme and modifying that though. You can change the theme in /etc/plymouth/plymouthd.conf .
In the first case I think @devrtz has an excellent answer, but on the off chance you meant the logo it's in /usr/share/plymouth/themes/mobian/ . I would recommend making a copy of the theme and modifying that though. You can change the theme in /etc/plymouth/plymouthd.conf .