gunzip pfSense-CE-2.5.1-RELEASE-amd64.img.gz dd if=pfSense-CE-2.5.1-RELEASE-amd64.img of=/dev/sdX bs=1M status=progress
Downloading the is generally discouraged for production environments. It represents a snapshot of 2021 technology with security gaps that have since been patched. For a stable, secure firewall, navigate to the official Netgate downloads page and select the latest pfSense Community Edition (CE) release. Pfsense 2.5.1 Download Iso