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This question already has an answer here:

I updated my Android phone with Android N using Android Beta Program, Now if I factory reset my phone, will it revert the OS version back to the old one?

marked as duplicate by eldarerathis Apr 20 '16 at 17:30

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A factory reset will not downgrade your device to Marshmallow. To downgrade to Marshmallow, unenroll your device: https://www.google.com/android/beta.

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