Just completed unlocking the bootloader and rooting. Yay! Ok I'm on my PC and when I go to download a custom kernel, I choose my Nexus 4 as the save location and I get a prompt that says "You cannot save here" on my PC. I've tried every file in the nexus 4 sub menus as a save location for the download but no beans. It is a ZIP file. Whats going on?