extracting and modifying a firmware
 

I want to extract the firmware from my mp3 player so I can change the theme and modify some seting. But the only problem I have is that I can't extract it in .bin format ( can't use any s1 tools on it ).
It's there any other way to change the theme and some setings?
a pic with my player:
http://i288.photobucket.com/albums/l...2c32fe70e5.jpg2 Inch display
[sup:1d0e2145d7]Expert Digital-UC84[/sup:1d0e2145d7]

I only know that it's a RockChip..