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I am also experiencing the same problem. I think it's not working because the APK signature is different, but what can I do? I guess I'll just have to wait until the developer uploads the 3.0 update.

(I used a translator, so the sentences might sound strange. I apologize.

Hello, I am using an Android version. I am trying to update the version from 2.1 to 3.0, but the file is not installing. Using SAI doesn't help either. Is there something wrong with my device?