Upgrading to the latest version
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Under FortiGuard Firmware, select Latest. A notice may appear stating that there is no valid upgrade path for this firmware version. If this is the case, select All available instead and find a suitable firmware version for your FortiGate.
For more information about the upgrade path, go to Fortinet Support.
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If no warning appears, select Release notes to learn more about the firmware build. Release notes are also available at the Fortinet Documentation Library.
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To upgrade your FortiGate, select Backup config and upgrade. When prompted, select Continue.
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Save the backup of your current FortiGate configuration, in case you need to restore it after the upgrade process.