title: Android apk replace vs Update
body: <p>I have an application already installed on the mobile, am trying to install the update version of it. </p>
  
  <p>I placed the apk inside the data/data folder, using file manager at the path,am trying to install it -
  it shows a dialog to replace but not upgarde (Signed with the same key-store and version code/version name has an incremental value).</p>
  
  <p>Could someone explain me more on this?</p>