[Nexus 7 (2013) Q&A] masterchiefb117:
Couple of new tabs were recently released into the wild with some "revisions". Those who went thru Groupon, Frys, and Best Buy received tabs with 5.0.1 pre installed out of box.. Because of this you couldn't go back to any 4.x.x builds as the bootloader wouldn't allow it. After posting this and finding out about this issue some XDA members were able to find a fix and confirmed that this solution is a working solution.

TL;DR

Any Custom Recovery had problems mounting SD/Partitions making flashing roms, zips, ect a problem.

**WARNING**

I AM NOT RESPONSIBLE FOR ANY MISFORTUNE YOU RECEIVE BY APPLYING ANY INFO PAST THIS POINT. YOU TAKE SOLE RESPONSIBILITY FOR YOUR ACTION AND NO ONE HERE BUT YOURSELF IS ACCOUNTABLE.

I have included both LTE (DEB) and WIFI(FLO) setups that are currently working and are confirmed working by XDA members here. Apply based on your device. This works for both 5.0.1 and 5.0.2. ADB or Wugs program is sufficient enough to complete this task.

WIFI (FLO) https://drive.google.com/file/d/0B3fHxCdm5V_Mc2szNnFzT1I0eVk/view?usp=sharing

LTE (DEB) https://drive.google.com/file/d/0B3fHxCdm5V_MU1hfXzV6dFlEZ2c/view?usp=sharing

**NOTE**

The only way so far to root tab is to use cf-auto root. Google it and follow directions.

ADB setup:

Download recovery img and place into location where you ADB resides (or leave in download folder and open CMD in downloads for global ADB users)

make sure ADB is working and confirm that you Nexus is recognized

Code: adb devices

After confirmation get tab into bootloader mode

adb reboot bootloader

Flash recovery image (Depending on tab version)

FLO:

fastboot flash recovery TWRP_multirom_flo_20150328.img

DEB:

fastboot flash recovery TWRP_multirom_deb_20150328.img

Once flash is complete confirm by booting into recovery and check to see if SD/Partitions mounted. Click the small square in the bottom and see if everything mounted correctly. if you see any red status stating mount error in (system, userdata, system -w, cache, ect something went wrong repeat process)

From this point your are good to go. Be advised flashing roms has a very particular setup that needs to be followed, reported by several members. I will show below

Wugs Nexus Toolkit

http://xdaforums.com/showthread.php?t=2389107

Download your recovery image

Open Wugs Nexus Toolkit

Setup device preference

Go into advance

Click flash recovery

choose recovery image file

Let toolkit do its thing and when complete click boot recovery to confirm everything went ok

On device

Use cf-auto root to root your tab. Google it as it not hard to find. Once you confirmed root you can then download your image file on device and use flashify, TRWP Manager, (anything you can flash recovery on device)

Example:

Once root is confirmed use Flashify to select recovery image to flash. Once flash is complete boot into recovery by any means. confirm no error are present.

**FLASHING ROMS**

When installing any ROM disable "inject multirom after installation" & after installation just hit reboot system (don't hit "MultiROM: Inject curr. Boot sector) once you hit reboot you should be fine!

Direct link to files and some info for recovery

http://xdaforums.com/showthread.php?t=2457063

Good Luck and hope everything works out.