Hi eranga,
I think you might be in luck.
s1fw has mentioned about an awesome site that has a huge collection of MP4 player firmware (have a look at this post here:
Largest search engine for firmware - en.s1mp3.net).
I guess going to here:
http://en.s1mp3.net/.
Then search for "
ak1025".
I just did it and it found heaps of firmware you can try.
Good luck and let us know what the outcome is. More importantly, if you do find the solution, please let us know.