summon night not saving?

in-game i'm able to save, but when i turn it off then turn it on again, there is no saved file. im sure i had plenty of free space left then so there should be no problem with creating a save file.. by the way i have a supercard dsone with the latest firmware, v3.0 SP4.
what could be the problem?

you may need to wait for a newer firmware.

Or you could try using an older firmware versiion, if that doesn't work, wait for a new one.

oh thanks ive solved it finally. just played with some of the settings on the card's newest os..