marshmallow downgrade/samsung ID bypass

hello guys!
I am currently locked out of my device, galaxy note 4(sm-910c) after I did a hard reset on my device. I don't have the samsung ID that was used to login the device and i can't downgrade it to lower versions(lollipop or kitkat).
Help please for anyone who knows how to downgrade it from android 6.x or how to get samsung ID from IMEI!

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