I'm waiting on Kit Kat to finish doing its update to my Nexus 7 and I'm highly excited! I am running Windows 8.1 Enterprise and had to tweak a few things in the SDK to make it twerk..... Boiya! If anyone is trying this manually and gets the error "Device Not Found" please hit me up and I can walk you through a fix. The ADB Composite Driver can be a pain to get to work...... PEACE!