How to find what Firmware I need

[highwattage]

Hello everybody,
I bought a MP3 player of ebay, and a day after receiving it I got the Hour Glass. The seller sent me some firmware, and I loaded it and now I got a dark blue screen(but if I press the buttons by memory, I can get it to play music), and now the seller does not exist. So I am looking for help.
The player was supposed to be 8G 2nd generation nano. But after formating it, I now find out it is only 1G.
The firmware sent by the seller was V9.1.52 Wilson Co. LTD Lisong MP3 Player.
I tried to see if I could take it apart to find the number on the chips, but it seems very difficult to slide out of the case, I didn't want to force it to much so I left it.
So the question if how do I find out what firmware I really need. I suspect that the dark screen is because of incorrect firmware.
Any help will be much appreciated,
Thank you.