one obvious thing to check the button next to eject is it an I or a star.
if it allows you to see hold the setup button down for about 20 secs if it stops on AM FM then you can't find out, if it goes past AM FM to next screen then the firmware will be on there 4 digit number
32gb might be 2 big for the unit to read you see, can you try a 2 or a 4 first?