Sunplus mp4 player crashed, doesn't switch on
 

I too bought one sunplus pmp from here
http://www.homeshop18.com/shop/u/y/p...lI_2-q_imedia-

its been one year now..it was working perfectly..but somehow yesterday when I was playing an nes game it crashed and now it does'nt even switch on.sometimes it does but crashes
I think I need to reload the firmware.Plz provide me with step to step instructions as I have little knowledge about all these.
not to forget it had a blue background behind the menu.So plz tell which firmware is compatible.
thanks