annoying demo

hi guys iv just installed the free jjos on my mpc 1000 and still can't seem to get rid of some annoying demo beat that comes up, of course i can erase it every time but i don't want to, iv tried reformating but can only seem to do that for my sdcard which of course it is not on, any help?

Another question that gets asked here at least once a week. Please search before posting.
You cannot erase the internal stuff but you can overwrite it.