zalude,
I have the same player as you (outer casing-wise that is).
What operating system do you have? s1fwx only works on Win 2000 or Windows XP. Others like Win ME and 98 won't work unfortunately.
As tadad mentioned, s1fwx only detects ACTIONS chipped players. You might have a Sigmatel or Sunplus chip instead. If this is the case, then unfortunately there are no tools that I know of that lets you extract the firmware and modify it for these chipsets.
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