Root a Samsung Galaxy 4 tab 7", Kies isn't working

I am trying to root a Samsung Galaxy 4 tab 7″. The box says SM-T230NU with a label “Model: SM-T230NYKMXAR”.

I got drivers from here:
http://www.samsung.com/us/support/owners/product/SM-T230NYKUXAR
which is slightly different number (has a U instead of M) but matches (ie. Samsung Galaxy Tab® 4 7.0 8GB, Black). I installed these and the device connected to the PC with no problems.

Using Odin 3.07, it detecets the device. I click the PDA button and select CF-Auto_Root.tar, then Start and I get this error:

Firmware update start..
recovery.img
NAND Write Start!!
cache.img.ext4
FAIL!
All now when I restart I get this message:

Now when I restart I get this message:
Firmware upgrade encountered an issue.
Please select recovery mode in Kies & try again.threads completed. (succeed 0 / failed 1)

I downloaded and installed Kies 3. When I run it it says “The connected device is is not supported by Kies 3”.
It should be, this is 4.4 KitKat

So I tried Kies 2.6, and it doesn’t connect either. It doesn’t give this error message, just keeps trying to connect but doesn’t.

What can I do now?