samsung S6 triangle away & Screen Mirroring doesn't work

Hello everyone
My Phone
samsung S6 SM-G920F android 5.1.1

i bought triangle away (i have TriangleAway.zip that i can share)

- i have root it with KingRoot 3.2 desktop
- now i have Root,
- i can't install SuperSu free v2.65 by Chainfire
- now my Screen Mirroring does not work anymore

can you help me?
thanks

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