Deployment error (First-time deployment)

Error 2 Cannot deploy the base assembly ‘mscorlib’, or any of his satellite assemblies, to device - USB:USBizi twice. Assembly ‘mscorlib’ on the device has version 4.0.1681.0, while the program is trying to deploy version 4.1.2821.0

I guess you need to update your FEZ board.

You need to update your firmware. Look for the tutorials in the downloads section.

If you read that, you can see that you are trying to deploy a program (with new sdk) to a adevice with a lower firmware.

Device: 4.0.1681.0
You try to deploy: 4.1.2821.0

Updating firmware: