We have an app published on play store and the developer has given us the unsigned app. How do we proceed in updating the existing app without it being signed? Is it possible to update an existing app with an unsigned apk after we sign it?
It is not possible to publish unsigned APK on Google Play.
Ask from your developer for
1) source code,
2) KeyStor file[.jks file]
3) Keystore password,
4) keyAliase password
5) Generate new signed APK using keyStore file provided by your developer
6) after generating new signed APK, you can update your existing google play application by new APK.