Help with FF Tactics A2 Grimoire of the rift!!!

Hi everyone! I'm having a big little problem with the game mentioned before. After the 3º mission (counting the one from the beginning), any of them, I try to save and the screen goes black, but I still hear the music. I've left it like this for hours, and nothing happens. HELP!!

PS: I'm using a Ninjapass X9 Evolution, with latest firmware.

 

I recommend you get a better flashcart later, no one uses Ninjapass anymore You could try backing up and reformat, see if that will do anything.