Failure [INSTALL_FAILED_ALREADY_EXISTS] when I tried to update my application

Question

when I tried to update my applcation with new version that has same signature as previous one, shows above error.

What I am missing?

Answer 1

If you install the application on your device via adb install you should look for the reinstall option which should be -r. So if you do adb install -r you should be able to install without uninstalling before.