Need Firmware YJ-818 MP4 Player China

[dooshi]

Salam (Blessings) to all of you

i am new here in this blog and i need assistance seriously for my mp4 player
accidently i lost my mp4's firmware and i dont know how to get it back means 16MB partition has been formated without the backup of firmware ops:

need the bios

MP4 Player
chip ak3221NB24404

here is a page which contains exactly same mp4 player

http://www.chinavasion.com/product_i...en-sdmmc-slot/

i have tried many of the firmwares and non of them works properly

please help :?:

Thanks in advance

Allah hafiz (May God take protect you)