Desmume Save Pokemon

I have problems to save Pokemon Black 2 in Desmume, the game works fine as far as I see, when I save it works fine, but if I restart the game does not display a save, is a new game again. Download my desmume in tutorial to achieve desmume WIFI enabled.http://forum.romulation.net/index.php?topic=54397.0Please Help T.T

Use pre-patched rom, and the save file should be found under BATTERY folder.