System : System > Settings

Firmware Auto-Update
Sonic OS supports the Firmware Auto-Update feature, which helps ensure that your Dell SonicWALL Security Appliance has the latest firmware release. Firmware Auto-Update contains the following options:
Enable Firmware Auto-Update - Displays an Alert icon when a new firmware release is available. This setting is enabled by default.
Download new firmware automatically when available - Downloads new firmware releases to the Dell SonicWALL Security Appliance when they become available.