Abandonio,
Have a look of s1fw post here:
http://www.mympxplayer.org/s1-mp3-pl...et-vt8747.html
Then try to find your firmware here:
www.s1fw.com
Then if still you haven't find your firmware,maybe you should try all the version
3.xx.xx firmwares that can be found on the download section.Theres no guarantee which firmware will work for your player its up to try them all.Give it a shot.
Goodluck!!