How to root a S2 TM810X-Retail model?

Hi!

Last week I got a S2 TM-810X Retail-Tablet (9.7, Wifi, 16GB).
This tablet is for shops or so and the Retail Mode starts the Tablet after a time between 3 minutes and 3 hours (you can select it) automaticly and reset all preferences, delete all files, pictures, installed apps and any kind of user changes.

So I want to remove this firmware and first step was to try to root with Odin.

I tried rooting with all of this files.
t810_5.1.1_boot.tar
t810_cf-autoroot_5.1.1.tar
t810_twrp_LL_5.0.2.tar
twrp_2.8.7.1_LL_5.1.1_t810.tar

I had success with "t810_cf-autoroot_5.1.1.tar". I see "SuperSU"-App on my tablet now.
But if I start this app I got an error -> "SuperSU stopped".
What do you mean: Is the tablet really rooted? And what is the best way to remove the "Samsung Retail Mode"-Firmware?

BTW: I had no success with the other tree files. I got an "PASS!" in Odin indeed, but after the tablet autostarted it goes directly to the main screen and not in a screen like I got after cf-autoroot ( see at imgur.com/a/hwzMS )

Sincerly Andy