Xamarin.AndroidTools.AndroidDeploymentException: InternalError ---> Mono.AndroidTools.InstallFailedException: Failure [INSTALL_FAILED_UPDATE_INCOMPATIBLE]
I've come across this problem several times with different physical Android devices. This message is thrown when a real production Google Play App with the same App Id has been installed and then you try to install a debug version. It will happen with any means of deploying a debug version including with Visual Studio, Xamarin Studio, and the command tools.
I think what is happening is that Android is not happy with a debug version being deployed over the top of a properly signed and deployed version of a Play Store App. Android stores a flag to block further install attempts for that App Id. When an App deployment attempt is made, the flag that Android created is not reset.
To fix this, you will need to reinstall the App from Google Play and then uninstall it normally. After that you'll be able to debug your App with Visual Studio.
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