This section describes how to change from Policy mode (SonicOSX) to Classic mode (SonicOS) on an existing NSv deployment.
IMPORTANT: After this change, all of the current configuration settings will be lost and the NSv will reboot with factory default settings.
SonicOSX 7 introduces a new, redesigned unified policy configuration workflow combining Layer 2 to Layer 7 policy enforcement for security policies and optimizing the workflow for other policy types.
This update will necessitate a different GUI design and new features compared to the classic view of SonicOS.
However, if you are more familiar with our ‘Classic’ design, it is possible to switch to it. This is recommended for initial deployment, as the firewall will reboot with factory default settings.
STEPS:
1. Log in to mysonicwall.com using the account where the NSv was registered.
2. Search for the firewall by its serial number and click on it to view more details.
3. Enable the “Firewall Mode Switching” option under Product Details.

4. Wait until ''Security Services Enforcements'' appears in the firewall setting.
Network | Firewall | Advanced

5. Click on ''Classic'' and confirm any warning pop-ups. Firewall will reboot automatically.
6. Log in to firewall using default user and password admin/password. Firewall will ask for new password.
7. Register the device, choosing the CLASSIC option.

8. Disable the “Firewall Mode Switching” option from mysonicwall.com and Product Detail.
For adittional information about SonicOSX and SonicOS, please refer below link: