What program can I use to modify my mp4 player's firmware?
 

Hi, I bought a mp4 player from ebay recently and I wanted to change its theme to the ipod nano theme. Where can I find this theme and what program can I use to modify its firmware?

On the firmware version section it says:

MP3 PLAYER
XTD_91N51_V5
2007-07-14
9.1.52
2006-05-17

I tried using the developmental tool s1fwx_v32 to extract my firmware but I got the image below. Any ideas?

Thanks in advance.

http://img218.imageshack.us/img218/3306/s1fwxv32sv6.jpg