I recently got a whole new set of cheats, for my R4 SDHC. It WORKED PERFECTLY earlier. However NOW, when I try selecting cheats from the R4 menu: 1 - I select ENABLE 2 - I choose my cheats. 3 - Press SAVE AND EXIT 4 - When I go back to the menu, they are STILL disabled and the cheats don't work in the game. What's wrong?