Legacy boot is done from the boot sector (MBR), so replace it with a "vanilla" (empty) boot sector. Maybe just marking none of the partitions as bootable will be enough. (clearing the boot sector may delete your partitions, so careful)
Regards, David On Wed, 5 Aug 2020 at 15:09, noone atall <[email protected]> wrote: > > help-grub <https://lists.gnu.org/mailman/listinfo/help-grub> is a list for > getting help for GRUB. Subscription to the list is not required to post a > question > > Hi, > I read this and i hoped it would be okay to ask a question. > > I have an old motherboard that is unable to boot usb devices in EFI mode. > Which means it only boots hard drives and cd/dvd in efi mode. As i have > encountered some issues with dvds and i don't like them in general i > decided to use hard drives as installation media. > > However, the Manjaro linux iso is set to boot both modes. As it is based on > grub i decided to try my luck asking help on grub forums, which apparently > is not present so here i am. > > Long story short I would very much appreciate it if you could tell me which > files and folders one needs to remove from grub bootloader to destroy it's > capability to boot on legacy BIOS firmware.
