A workaround I've find out:

1) Export your app *unsigned*
2) Sign with your keystore using jarsigner (in your JRE directory)
3) Zipalign the apk

Then you'll be able to upgrade the app. Still, you have to do this every 
time you want to upgrade the app, since exporting it from Eclipse generates 
the same issue again.

It's all related to debug.keystore, in my opinion. Somehow the app is not 
signed correctly.

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