Hi ganesh040,
Currently the
s1fwx tool (available for download in our [Downloads] area) can
not extract the 9.1.52 firmware. That seems to be the only reliable tool that can extract s1mp3 player firmware. I haven't seen any other.
Hopefully s1fwx will be able to extract 9.1.52 chip players in the future.
If I do find anything, you'll be assured that everyone will know about it
.