I came here today to start a thread about my BOXD34010WYKH1 running Windows 8.1 x64 and an Intel Dual Band Wireless-AC 7260 adapter not working. I've tried everything I could think of to make it work and have the latest drivers. Then when I got here I noticed v025 of the BIOS was out, I was running 024. I updated and unbelievably the WiFi adapter just magically started working!
So I thought I would start this thread for anyone else having this problem to try and save them some time and trouble. Try upgrading to 025 BIOS or later. It was all I needed.
Thank you very much for sharing this information; it can be very helpful to others.