xamarin android app does not update on device because of keystore

I deployed an android app with Xamarin , after it Works I reinstalled my windows and xamarin on my machine. now I need to upgrade my application. but when I try to install update my previous version on device I get assembly error.

I need to update it or export the sqlite db from the device I created the db file with this code :

DBFolder = System.Enviroment.GetFolderPath(System.Enviroment.SpecialFolder.Personal);