Removing Marshmallow from a Nexus 7 (3013) without using UI

After installing the latest update of Marshmallow (6.0.1) on my Nexus 7 (2013 Edition) the touch functionality got totally broken. I am not able to do nothing using the touchscreen so I can not access UI to enable developer options and then allow USB connection. Is there any way I can allow this option using a command line? I have tried everything, I restarted to bootloader , I went to recovery mode and delete cache and also reset to factory settings. And the touch functionality keeps broken. I need to remove marshmallow and go to a previous version but for doing that I need to be able to allow the usb access to my nexus without using the UI.

I will appreciate any thought.

Thanks!!:)

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