Bug with loading X5000 loaders boot configuration

When I recently should start up the x5000 it stopped at the point where the computer writes select boot config... but the test is garbled not legible

the boot config states... well it makes no sense remembers me about unicode/text translation errors, it probably is just the boot configuration which somehow have been corrupted, but is there a easy way to fix such a error? without having to change gfx-card and so on... (pain in the ...) for instance why can't you alter the boot config in the u-boot cmd line (or can you?) which would make sense, or some other way to boot with rx-580 attached? don't
have enough slots for two gfx-cards I do have pci-e 1x, 4x, 8x expanders but... I assume the system would not like to see a radeon HD and a radeon RX at the same time without some mucking about. I do have a picture that shows the error... but it is a bit of a hassle to upload it...