title: I can't update my apk
body: <p>I made an app and successfully published into the Play Store. Then I discovered a bug and fixed it. Now I can't update the app because it says that the certificate of the two apks are different.</p>
  
  <p>Using the Eclipse signing tool, I tried filling in the same things I wrote the previous time, but that's not it. I saw that if I link the old apk, I can use the "use existing keystore", although I can't select an alias.</p>
  
  <p>If I try to create a new keystore and fill in the same things as before I get a "keytool error: java.io.IOException: Invalid Keystore format".</p>
  
  <p>Please tell me how I can update my published apk.</p>