brzinski sam bacio google, pogledaj na ovome linku, ovo je za vracanje na marshmallow, ali vjerojatno mozes na standarni N isto
http://www.ibtimes.co.uk/how-roll-back-android-n-developer-preview-latest-marshmallow-firmware-1549199
Unennrollat nemogu jer su ubacili vec Android O, a mobitel mi jos na Android 7.1.2 build (NPG471) i na march security patchu