Toolkits for Mac OS are not easy to find. Most root/unroot/lock/unlock utilities are meant for PC users. I found this utility here to assist me in rooting my Nexus 7 (2013) LTE Model which I recently purchased.
These toolkits will allow you to root, install TeamWin Recovery, unlock bootloader, and lock bootloader. All with a simple click of a button for your Nexus 7 2013 model!
How Do I Use These Toolkit?
1. Download the toolkit of your choice using the links below.
2. Unzip the file and click on click on the green Android icon.
3. Enter your phone into bootloader mode: First power off your tablet and make sure it's unplugged then,press the volume up, volume down, and power button all at the same time. When your phone vibrates let go of the power button, but keep holding onto the volume up and down button. You will now see a green start screen.
4. Follow directions on the screen.
One-Click Root Toolkit
One-Click TeamWin Recovery Toolkit
One-Click Unroot/Stock ToolkitOne-Click Unlock Bootloader Toolkit
One-Click Lock Bootloader Toolkit