HTC M8 Android 6.0 rooting

Hi

I need to root my HTC M8 for a Project (using in a car as multimedia Device).
Unfortunately i already updated OTA to android version 6 :(
I've tried Tools like rootking => not working!

How i can easily root my device? I'm not really an expert but i have some small basic know how..

Many thanks in advance for any hint
Kind regards
Andy

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