Models with (like the FortiGate 40F or 60F) now have restricted features, losing support for proxy-related functions and Security Fabric topology to optimize memory. Critical Upgrade Best Practices Update FortiGate firewall firmware | Selectel Documentation
IoT Identity Behavioral Drift Protection latest fortigate firmware
The absolute as of this writing is FortiOS 7.6.0 (GA). However, "latest" is ambiguous: Models with (like the FortiGate 40F or 60F)
The latest FortiGate firmware includes several security enhancements that address known vulnerabilities and improve overall network security. Some of the key security enhancements include: latest fortigate firmware