If you would like to modify the theme on your player, then have a read on these Knowledge Base articles (or by clicking on the "Knowledge Base" link on the left hand side menu).
First you need to determine whether you have an ACTIONS, Sunplus or Sigmatel chip board. The articles here are written for ACTIONS chip boards and are the more common type.
To reskin/theme your firmware follow these Knowledge Base articles:
1. "
How to: extract firmware of your player using the S1fwx tool" from
here.
2. "
How to: Modify your firmware using s1res tool" from
here.
3. Finally, "
How to: Update the firmware for your MP3/MP4 player from
here.