please need help for mod a ff x hd save

i im new.....and im a noob....i tryed to use brutalforcesavedata to modify a save file of ff x hd.....i need only a couple of things....now....i tryed but every time bruteforce dont give me the option to decrypt the save....but in the bottom say decryptable.....somebody can help me?i can give the save file....somebody can modify for me?is a BIG help for me....or tell me why i cant decrypt the file....please please...