This article explains the steps for how to delete the firewall acquired on NSM.
The steps to be followed is mentioned below:
Step 1: Log into the NSM management page via MSW account|Available services|Capture Security Centre or type cloud.sonicwall.com on the browser window.
Step 2: Navigate to Manager View and select Firewall> Inventory on the NSM management page

Step 3: Select the Firewall unit on the inventory list and click on Action button as shown below
Step 4: Click Delete Firewall to remove the unit from NSM

