get hardware status → Look for "Platform." If your model is on the EOL list, the "latest" firmware may be 7.0 or 7.2—not 7.6.
Fortinet’s proprietary operating system, FortiOS, powers the FortiGate next-generation firewall (NGFW) ecosystem. Fortinet actively maintains multiple firmware branches simultaneously to accommodate different enterprise needs: latest fortigate firmware
The cluster synchronizes, and traffic roles settle back based on your configured HA priorities. Conclusion get hardware status → Look for "Platform