Nexus 5X Problem

Hi,

I have a problem with my Nexus 5x,
After installed Android N, I decided to go back to 6.0.1
So I unroll my device, downloaded the Marshmallow and after the installation when the phone is trying to turn on it starts to block, right after the GOOGLE logo and starts over, so all I can do is to let it starts over and over and over ...

Please advise

Thank you

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