Hard to understand the OP but if you get the notice that your upgrade has cleared your mobile BP should update. Any questions from anyone just show them your mobile BP. If the app doesn't refresh just ask for a paper BP for boarding. If you go to board and the GA says your upgrade just cleared and doesn't give you a paper BP, well they're the person that told you that you were upgraded. Doubtful they would then try to take it away unless someone that paid for that seat got to the gate late and the agent then downgraded the upgraded passenger.