You can de-register an SMA 500v for Azure 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 Azure instance. Only one SMA 500v for Azure instance is allowed per serial number.
To De-register an SMA 500v for Azure
Log into the Secure Mobile Access management interface on your SMA 500v for Azure Virtual Appliance.
Navigate to the System > Settings page.
Under Settings Management, click Export Settings to export a copy of your current configuration settings before de-registering your SMA 500v for Azure. This makes it possible to import these settings to another SMA 500v for Azure instance.
Be sure to export your configuration settings before de-registering your SMA 500v for Azure. You cannot recover them after de-registration.
Navigate to System > Licenses.
Under Manage Security Services Online, click Activate, Upgrade, or Renew services and log into your MySonicWall account.
Navigate to Product Management > My Products, and select the SMA 500v for Azure you would like to de-register. Click Delete Product on the far right of the row. A dialog box appears requesting the reason.
If the de-registration is successful, the SMA 500v for Azure returns to the unregistered state.