Please Help with this problem Korg pa50sd

[Alimbeg]

I recently bought korg pa50SD, and I ordered styles from ebay, I got them, and installed them to my item, some styles play well, they have drums, bass, acc, and everything, but some other styles like 6/8, and some rumba styles dont have drums, their sound is really low, acc is weak, I dont know why, they sound like they are being played on piano, maybe I did something wrong with settings. If you dont know the answer to this. Could you tell me how to restore Korg pa50SD to factory settings, thanks!

Best Regards.