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Do not jump directly from a very old version to the newest. Use the official Fortinet Upgrade Path Tool to determine the required intermediate steps (e.g., 6.4.x -> 7.0.x -> 7.2.x).

After downloading the .out file to your computer, use a local checksum utility (like PowerShell's Get-FileHash on Windows or sha256sum on Linux). fortigate firmware download

3. Understanding FortiOS Release Cycles (Feature vs. Mature) Do not jump directly from a very old version to the newest