I have had the D54200WYKH1 for a month and yesterday tried adding Intel AC 7260.
I have Windows 8.1.
No problems with hardware install. Downloaded and installed latest Intel Proset drivers for the 7260 (17.1)
Both bluetooth and wifi wouldn't work.
I then updated to latest Bios for D54250WYKH1 (0030) and installed the latest driver package.
Still not working. Uninstalled and reinstalled 7260 drivers. Didn't work.
Downgraded to 17.0 drivers. No luck.
I wasted 4 hours last night trying to get this card to work. I've searched the forums and have seen similar problems but no definitive solutions. Please help.