Help whit FIrmware for Qihan QH-D4416A-H dvr

Hi, before i start describing my problem, i need to say im not good whit english, so forgive if i dont spell right a word.-

well, my problem is i have a Qihan QH-D4416A-H Dvr, unfortunately the LAN adapter is toasted, i know these dvr can use a wifi adapter, but i guess my firmware is to old to recognize my usb wifi card.- so i was looking for firmware upgrades and i cant find anything, fi someone can be so polite to send me the firmware upgrade or at least tellme where i can get it i will be really grateful.-

my email adress is: josesaini@gmail.com

thanks a lot for your help