Press 'x' when the game is highlighted to bring the options box up, then press the top option 'change' to change the save size to the correct one, you probably have to look the size up, there's a list on this site.
If that doesn't work try you can try more option.....the clean save mode (turn off the patch option) or use real-time save or use dstt or y's menu via the tripple boot os.