You can update the SonicOS image on a SonicWall security appliance remotely if the LAN or WAN interface is configured for management access. On SonicWall NSsp and NSa platforms, you can also connect directly to the MGMT port and point your browser to that IP address (http://192.168.1.254 by default) to log in and perform the upgrade. For MGMT port access, first configure your computer with an IP address on the 192.168.1.0/24 subnet, such as 192.168.1.20.
To upload new firmware to your SonicWall appliance and use your current configuration settings upon startup
Your new SonicOS image version information is displayed on the Settings > Status page.