I bought a Nexus 5 from someone and everything was working fine. I brought it home to flash another ROM and when I downloaded the zip file and booted into recovery, Team Win 2.6.3.1, I erased everything like I normally would but didn't realize this recovery wiped everything, the ROM on the root of the drive and the OS. So now I have a phone with no OS. I tried downloading the ROM to my laptop and mounting the phone over USB but it's not working. Any suggestions guys?