How to root with CM12.1?

Hi all,

I need some help for I am stuck.

I read a bit about how to get CM12.1 on it. The phone is a i9505 and it came with Android 4.4.2 Stock image. Then I did the following.

1. I installed Kies and Odin and finaly applied cf autoroot
2. Then CWM Recovery
3. Factory reset, etc and CM12.1
4. Booted into CM12.1

Seemed to be a bit too easy...

I discovered that it de-rooted itself again. I tried a lot but to no avail.

-Philz Touch and re-root
-cf again
-towelroot
-kingroot as apk
-kingroot on windows
-mobilego
-superSU

It is always the same root failed, device not supported and so on. I'm running out of ideas. Or do I have to got back to stock image and recovery and start all over, if that's possible?

Thank you for help!

e-sheep

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How to root with CM12.1?