My Nexus 7 2013 has no OS. Can anyone help me get one?

[AC Question]

So my Nexus 7 2013 is rooted, and I was installing Resurrection Remix on it, until I remembered only when I tried installing it via TWRP that it was for the model name "DEB" not "FLO". I have ADB and fast boot on my Macbook installed and running fine, except the mac itself won't recognize the device. I found an USB to micro USB adapter so I can plug in a flash drive, and still nothing. The port is as clean as when I first got the device. Any help would be very appreciated. Thanks!