Using my repository for ionic pro auto update

We are new to ionic pro, we are having the 2 major doubts in this,

  1. We have to use our own repository to update files and connect to ionic pro for auto push
  2. We need to know the possibilities of update our previous app code automatically without publish in play store or itunes. We are having our previous app developed in ionic1 and currently users are using that app. Now we are updated to ionic3 and made some changes in functionality. So now we have to update this new app to all previous users is this possible without update in app store.