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Is it possible to release an update of an android app by signing it with a different certificate than the one originally used? I know it gives an error message normally when we try to upload such a build to the market. But is there any way out, like marking it as a major release, specifying somewhere in the market place?
No, you can not do it. The certificate is a tool to ensure you’re the one who firstly uploaded the application.
So always backup the keystore!