you can use the new super mario bros and the savemii method...
put a gamecube controller in slot 4 hold up down left and right (need to take controller apart to do it)
then boot the system while holding the buttons
Version should show on bottom right of screen, then pop in the nsmb and something should happen (thats what i did to fix it)
the screen will/should go black, i let it sit there (just in case) after 2 - 3 mins i reset the system and got my menu back.
also the game has to be legit, not a burn.