Stock: ( Rooted same process minus the rooting:P ). OTA (over the air update) to 4.2. Download this tool. Connect your device to computer. if you don’t have drivers for your nexus 7 you can get them in the tool kit (do this if you haven’t). Choose 4.2.2.

Make sure your in fast boot mode (hold power and down for that till recovery pops up). 1-click for all (unlock, root, rename, custom recovery, busybox). Choose which super user you want it doesn’t really matter. pick a recovery option i use twrp but both are good. read the toolkit and then type yes to continue. is your tablet locked or unlocked tell the tool. then let it do its magic.

Download this 4.3 stock rom. Ms-163a driver for macbook pro. now that you’re rooted boot into fastboot then into recovery via the volume up button then press power. TWRP/cwmod should pop up now click install. and navigate to your 4.3 stock rom and install it. Now your good to go enjoy!.

Nexus 6 Root Toolkit Download

root with the same method as above.