[Nexus 7 (2013) General] Feliox:
After few hours of playing with the new Android 5.0 Lollipop on my Nexus 7 2013, it looks like a stable OS with dramatically improved performance and battery life.

So I decided to write a simple guide to teach you how to flash it on your flo, and successfully get root access ;)

This tutorial works on Windows.

This process erases everything from your nexus, so BACK UP!!!

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#include <std/disclaimer.h>
/*
* I am not responsible for bricked devices, dead SD cards, thermonuclear
* war, or the current economic crisis caused by you following these
* directions. YOU are choosing to make these modificiations, and
* if you point your finger at me for messing up your device, I will
* laugh at you.
*/

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1. Unlocking Bootloader

So the first step is to unlock your bootloader, but I think you already done that. If you don't, there are lots of tutorials on Google. (Your nexus doesn't need to be running original rom, or anything stock, if you can get to bootloader normaly, you're fine.)

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2. Flashing the 5.0

We need to flash Android 5.0 Developer preview! (obviously).

1. Go to

http://developer.android.com/preview/index.html

and download the .tgz for Nexus 7 (Yes, your device IS called razor... :D)

2. Unpack it with Total Commander or something, I don't care..

3. Install standard ADB and Fastboot from this link:

http://xdaforums.com/showthread.php?t=2588979

4. Use WugFresh to install ADB and Fastboot drivers (If you haven't done that already)

5. Restart your PC!

6. Enable USB Debugging.

7. We need to test, if your drivers are working correctly so open up command prompt and,

adb reboot bootloader

Wait until it reboots to Bootloader and then

fastboot reboot

If it rebooted back to normal state, we're ready to go!!!

8. Reboot to bootloader by:

adb reboot bootloader

9. Execute a flash_all.bat from the directory you extracted tgz to! (It needs to be extracted!!!) This process also reflashes your bootloader to newer version, and you already know that if it fails, you have a pretty nice paperweight, so

DO NOT DISCONNECT YOUR DEVICE!!!

10. After everything is done, the Nexus will reboot and you have a working Android 5.0 on your nexus! Pretty cool already, but we are geeks and no android device is complete without the godly power of root access! So let's get into it!

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3. Flashing custom recovery, rooting, and fixing root!

1. Get your copy of the latest TWRP from here (I use 2.8.0.1):

http://techerrata.com/browse/twrp2/flo

2. Rename it to recovery.img and copy it to desktop

3. On desktop, press shift + right click on blank spot. (If you don't have one, move it somewhere else where you can find it) Select Open command window here.

4. Enable USB debugging on your nexus again.

5. Move this zip to the root of Nexus's internal memory.

http://download.chainfire.eu/578/SuperSU/UPDATE-SuperSU-v2.14.zip

6. Reboot to fastboot

7. Format cache by:

fastboot format cache

8. Flash the recovery! (make sure you're in the directory as the recovery img.. you can check that by typing dir.):

fastboot flash recovery recovery.img

9. On your nexus, choose to reboot to recovery (volume buttons up down, power to select.)

10. In TWRP install SuperSU zip.

11. Reboot your system.

12. After it booted back to Android, and you see the SuperSU in apps, reboot again :D

14. If you already tried, your root isn't working, so we need to fix it by flashing the chainfire's custom kernel. We 'll do it the fastboot way.

15. Reboot to Bootloader

16. Download the custom kernel from:

http://xdaforums.com/showpost.php?p=56109923&postcount=6924

17. Extract it, and flash it the similar way as recovery, but with using this command. Again, check if you're in the same directory as the boot.img!

fastboot flash boot boot.img

18. Now, just reboot with:

fastboot reboot

19. DONE!

Your Nexus 7 have working Android L with root access. Coolness overload!

Let me know if it worked for you!

If yes, please press that thanks button :)