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first remove elilo

slackpkg remove elilo

then remove the elilo files from /boot

rm -rf /boot/efi/EFI/Slackware

grub-install /dev/XXX

grub-mkconfig -o /boot/grub/grub.cfg

after updating kernel dont forget to run

grub-mkconfig -o /boot/grub/grub.cfg

splashscreen section GRUB_PRELOAD_MODULES=“all_video”

GRUB_BACKGROUND=/boot/grub/themes/slackware/background.png