You can de-register an SMA 500v for AWS directly from the Secure Mobile Access interface. Removing the registration puts the virtual appliance into an unregistered state and deletes the binding between it and its serial number in MySonicWall. At that point, you can use that serial number to register the same or another SMA 500v for AWS instance. Only one SMA 500v for AWS instance is allowed per serial number.
To De-register an SMA 500v for AWS
Under Settings Management, click Export Settings to export a copy of your current configuration settings before de-registering your SMA 500v for AWS. This makes it possible to import these settings to another SMA 500v for AWS instance.
Be sure to export your configuration settings before de-registering your SMA 500v for AWS. You cannot recover them after de-registration.