title: How to check if my Android release.keystore is correct?
body: <p>I received a release.keystore from the developer that was working previously on the project. 
  I created a custom debug.keystore based on release.keystore to test the app.
  Some of the functionality of the app is broken comparing to the app on the Google Play which makes me think I might not have a valid key. For example Maps don't display correctly (gray square).</p>
  
  <p>Is there a way to find out if I have a right key, that the previous app was uploaded with?
  thank you!</p>