Firmware needed to restore mp4 Samsung 725
 

I had used the recovery tool, i just now need the right firmware to restore my mp4 back to normal, my chip is the samsung 725 and my mp4 is the supposed 8gb mp4 lisong mp4 player. I got it off ebay and it looks just like the nano but where the play/pause button would be, there is a volume button instead. Please help if you know wher i can get this firmware from.