I attempted today to flash the Kit Kat factory image onto my Nexus 4, go tired of waiting and figured why not. I simply cannot get ADB Devices to recognize my phone. I must have done this 10 times between my Galaxy Nexus and Xoom. For whatever reason it will not work with my Nexus 4. I've tried 2 different computers, one doesn't list it then other list my device as offline. I have rebooted ( both computer and Phone), uninstalled and re-installed the SKD, and I've flicked the USB Debugger on and off a dozen times. Any advice?