R4 DS Cheat Problem :(

:'( i dont know why but i put on several cheat files for jump ultimate stars on my R4 DS and thenthe Cheat(Y) thing doesnt show up when i go to the game so i cant use cheats :'( can someone help me get them working (and yes i have the latest firmware i just got it today)

Some cheats are not allowed with all games, may I know what game you might be?

it's covered in the Common Issue thread