Right now i going to try mammoth method where I'm going to use the second PCI-E Slot and a separate laptop antenna (cos my current antenna is too short) I going to buy an airport extreme wifi card from the internet and try. If it did not work then i'm going to try 20pin method on the apple wifi card and mess around with the bios version, if it come to last resort. Hope it will work.
do you know how to get your internal wifi card working cos i tried a lot of kext and 20th pin method on the wifi card to force it to stay on when boot up but nothing is working? Have you tried the Mammoth antenna modification? My DV6-2155 (have same spec as you laptop but it a i5) and the antenna cable is too short for me. So i could not try it.