Hey i think i may be able to help if you are able to upload firmwares to your player, i got this software with my player I'm not sure i it will help.
http://www.mympxplayer.org/uploads-by-members-dc20.html
It should appear in that section after Admin have allowed it to be uploaded.
I also have a sunplus player but will not work, i tied shorting the pins but nothing the player just cuts out and restarts, any ideas?