mobile

Is my Galaxy TabPro10.1wifi completely locked, or am I doing something wrong?
I can't install any custom recovery and I can't root the device:

(I put cyanogenmod on my Nexus 7 2013, and that was a breeze, but this
is making me pull my hair out)

I just bought a Galaxy Tab Pro 10.1 SM-T520 from BestBuy last week.
It is wifi only (not a phone)
Android: 4.4.2
Kernel: 3.4.39-3336840
Build: KOT49H.T520UEUANK1

In everything that I have tried, Odin starts "initialization"
and just gets stuck there forever. On the tablet, I never see a bar
indicating any download starting, or progress meter.

I have tried looking through lots of threads and Google searches, but
I can't figure out how to get either a custom recovery or root.

It boots into and runs its stock (Samsung) Android OS fine.
I have turned on developer mode, and permitted USB debugging.

I'm using Windows 7 Professional 64 bit.
I have turned off MS Security Essentials and User Account Control.
Each time I run as administrator for Odin, or Heimdall, as well, for good measure.

I start up "download mode", and the TabPro says "Downloading..."
I connect the USB cable and Odin recognizes the device.

I tried to install TWRP using Odin with all the combinations:
I tried Odin 3.04, 3.07, 3.09, 3.10, 3.10.6
I tried TWRP 2.7.0, 2.8.0, 2.8.1.2, 2.8.6

I tried to root it with chainfire CF-Auto-Root with Odin 3.07 and 3.09
(download.chainfire.eu/392/CF-Root1/CF-Auto-Root-picassowifi-picassowifixx-smt520.zip)

Towelroot does not support this device.

I tried Heimdall for clockworkmod recovery and that didn't work either.

Thanks in advance - I would really appreciate any help.