I have more and more info now.
here is a "plan" of my player's inside:
[img=http://img67.imageshack.us/img67/9950/imaggeenn6.th.jpg]
wrotes on my Memory chip:
SAMSUNG 619
K9K...(here is a DITRON sticker on it)
wrotes on small chip at right:
SPT (in a circle)
SP3767HN
06D03
An on front of player, at bottom:
MP3-911.PCB VER 0.0
can anyone suggest me a firmware?