Tedbeau , if you go to the player's
System menu >> Firmware Version
you should be able to see the version of firmware installed in the player.
The S1fwx tool supports the 3.5.xx & 9.0.43 series.
Once extracted and repaired, keep it safely.
And you might want to upload it to the forum for others too. Upload link is
http://www.mympxplayer.org/dload.php...load&cat_id=20