Have a look at this post here:
Largest search engine for firmware - en.s1mp3.net.
There is a large database of firmware files available which you can search based on your board, processor and chip numbers. They have a larger database than we do, so you might have a better chance of finding the corrrect firmware fo your player.
Have a read of that post, find your board numbers than do a search on that site for it.
Good luck and let us know if you find the correct firmware for your player.