So you have got your Nexus 7 and installed some apps and games on it. But you haven’t rooted it yet, because you are afraid it might harm your device or you haven’t found an easy way. You don’t have to worry in the slightest, rooting the Nexus 7 is a piece of cake.
Here’s how:
90-95% of the process involves the Toolkit, and its done on the computer. So I’ll be showing you a few screenshots of the steps involved when using the toolkit. You can follow the rest just by following my steps.
1. Downloading and installing the Nexus 7 Toolkit:
The first step is to download the Nexus 7 Toolkit from here. Install it on your Computer and keep the Nexus unplugged. You will see a command prompt window open up. This window the main interface of the Toolkit. (Check the screenshots below)
2.Starting the Toolkit and installing the device drivers:
When you start the toolkit, it will prompt you to check for an update. Type NO and press Enter.
Depending on the OS of your device. Choose a number and press enter.
For eg: my Nexus is running on 4.2.1 and I selected 4 and pressed Enter.
Make sure that the Nexus 7 isn’t connected to the PC. Select to install drivers by entering 1 and hit enter.
My PC is running Windows 8 Pro, so I selected the 2nd option.
It will show you an error about the resource loader. Ignore it. Reboot the computer and reboot the Nexus 7 to continue.
3. Enabling USB debugging on the Nexus 7:
Now on your Nexus 7, go to settings> About Tablet and tap on the Build number seven times. You should get a message which says “You are a developer now”. Tap the back button and enable USB debugging from the settings.
Plug in the usb cable and connect the Nexus 7 to the computer’s USB Port. Now run the toolkit again and check the main menu, you should see a serial number. If not, plug it into a different USB port.
4. Unlocking the bootloader:
An Android device can only be rooted if the bootloader is unlocked. Some manufacturers make this a complicated process, but unlocking the Nexus 7 is too easy.
IMPORTANT: Backup the installed apps. You can restore them later.
DISCLAIMER: Unlocking the bootloader will erase your data. Backup before proceeding. AndroidPure does not take responsibility for loss of data or a bricked device.
Select option 3 from the main screen of the toolkit.
Type 1 in the unlock bootloader screen and press enter, and Type in No and press enter, to reboot to the Fast-boot mode and the Nexus 7 will reboot, and prompt you if you want to unlock the boot-loader. Press the power button on the tablet to confirm the unlocking.
The Toolkit will unlock the bootloader and return to the main menu.
5. Rooting the Nexus 7:
Now from the toolkit options screen, select option 4 – Rooting.
The Rooting menu has has 5 options, select the second one. Root and Install Busybox. 
The device will reboot. Re-login to your Google account on the tablet. Now Go back to Settings>About Tablet. Tap the Build number 7 times. Press the back button and go to developer options and re-Enable USB Debugging.
Now the Toolkit should finish the rooting operation and reboot. Reboot it again to push the superuser files to the device. This finishes the rooting process.
Enjoy!
Note: You can restore the apps you had earlier by selecting the restore option from the toolkit.
You can use this method to root the tablet even after the 4.2.2 update.
