Fortigate | Firmware

| Method | Best For | |--------|----------| | GUI (System > Firmware) | Small deployments, single FGT | | CLI (execute restore image) | Remote/scripted upgrades | | FortiManager | Bulk upgrades across many devices | | FortiConverter | Major version migrations (config conversion) |

Upgrading FortiGate firmware serves three main purposes:

If an upgrade introduces a critical issue, you can downgrade. However: fortigate firmware

Always keep a pre-upgrade configuration backup. If you need to downgrade, restore that backup after the firmware rollback.

Fortinet uses a structured versioning scheme for FortiOS. As of 2026, the major versions in common use include FortiOS 7.0, 7.2, 7.4, and 7.6. Each version number signifies a different branch or major release. | Method | Best For | |--------|----------| |

A common mistake is upgrading to the newest major version on day one. Instead, follow this proven lifecycle:

FortiOS follows a semantic versioning system: Major.Minor.Patch-build. Upgrading FortiGate firmware serves three main purposes: If

Before you upgrade, you must understand what you are upgrading. Fortinet does not simply release "updates"; it releases distinct branches of FortiGate firmware, each with a specific lifecycle and risk profile.