Zune updating device content
If your application expects a screen-size of 480x272 (Zune HD) or 240x320 (previous Zune models), you will need to adjust your application accordingly. Accelerometer input is now handled by the Microsoft Windows Phone SDK, which requires adding the Microsoft. Sensors assembly to your project and adding associated using statements in the sourcefiles in which you'll be using its classes and methods.
This can be done either by resizing your art assets to take advantage of the higher resolution available on Windows Phone OS 7.1, or by taking advantage of the built-in hardware scaling. If this was not added to your project by default, you'll need to add it yourself to access the XNA Game Studio touch input classes and methods. Accelerometer input, like many Microsoft Windows Phone SDK features, is event-driven, and you'll need to create an event handler to that will be called when accelerometer events are received by the game. Storage namespace doesn't exist for Windows Phone projects.
Since the Zune and Zune HD are only supported in XNA Game Studio versions including and prior to 3.1, and Windows Phone is a new platform as of XNA Game Studio 4.0, there is no direct way to update applications written for Zune to Windows Phone.
This topic describes how to port a Zune application from XNA Game Studio 3.1 to Windows Phone with XNA Game Studio 4.0 Refresh.
It is possible that a connection problem stems from update failure rather than user error.
Connect one end of the USB 2.0 data cable to your Zune.
This will be named, by default, Project Name Content inside your solution folder.Next launch the Zune Desktop software and you should get the following screen. The update will take a few minutes, and after it’s complete you should be good to go and can start using your Zune.To update your player in the future, go to General Settings then Player Update.Double-click the Zune software icon located on your desktop.Opening the Zune software will allow the device to connect to your computer.