USB Drive cum MP3 player upgrade

I have a 512 MB MP3 player cum pen drive from some Chinese company.[It has the name of a well known company on it & looks very real but I know its Chinese because its manual is written in Chinese.]

I want to know whether I can replace the memory card within to a 1-Gb one?

Also I want to know whether I can upgrade the software within so that I can play SONY-ATRAC encrypted files?

Please reply. . .