Can't update Note 5 after Board Replacement

[Android Central Question]

Recently I've bought Note 5 and ive updated it to Android Nougat and then after a few days it got board proble and ive replaced a new one and now its android Marshmallow.When i tried to update it from settings it sayd ive already got latest version.Device status is still official .Im afraid from flashing a new version from Sammobile.com if it gets imei problem.is there any solution to update it safely?

 

[B. Diddy]

Welcome to Android Central! Do you know what variant of Note5 you got the board from? If it was from a carrier-specific phone, it might need to be on that carrier's network to get the official OTA update.