nadenislamarre Unfortunately there is no options under "core", there is just "auto".That is all I get for some reason. I have put the image to a USB stick many times and it's the same every time. I have also tried putting these lines in the file \share\system\recalbox.config :
mame.emulator=libretro
mame.core=mame2010
But these just stop MAME from working at all, which would lead me to believe that it is trying to use mame2010 core but failing because the mame2010 core is not present in the s905 image?