You can't run a V3 series player with V9 firmware they have different hardware requirements.
But if you are willing to put in the time and experiment there is hope.
File browsing was in fact first introduced in 3.5.37 but not many manufacturers made the effort to update. This did not stop the resourceful chipod owner though some found it was possible to extract certain components from file browsing enabled firmware and introduce them into non browsing versions with success.
You have a couple of options, you can search the firmware archives for 3.5.37 firmware with file browsing and try them on your player in the hope that you will find a compatible version or you can try to modify your own firmware to include file browsing. No guarantee that either will work and you could end up trashing your player.
There is a thread on s1mp3.org on how to try to add browsing here:
http://forum.s1mp3.org/viewtopic.php...older+browsing