Help me JXD 852

Pls help me
I have a JXD 852 i don’t know update Firmware , my MP4 it die , i know it use rockchip but i don’t know modem rockchip pls help me i need a Firmware JXD 852 , now it die pls help me

this is a picture for it

http://www.mydigit.net/attachment/Type_jpg/87_206380_9c401030def474d.jpg