If your device is running a much older version (e.g., 5.0 or 5.2), you cannot jump directly to the latest 6.0.x build. You must follow a multi-step sequence to ensure configuration integrity. A common path for the 200D includes: → v5.2.9 v5.2.9 → v5.2.13 v5.2.13 → v5.4.x (e.g., 5.4.10) v5.4.10 → v5.6.x (e.g., 5.6.11) v5.6.11 → v6.0.x (Final target)
: FortiOS 6.0.17 (Build 0528) is widely cited as the final compatible version for the 200D hardware. End of Support (EOS) : The FortiGate 200D fortigate 200d latest firmware
It is a security liability despite its stable hardware. If your device is running a much older version (e
is also aging, current modern replacements would include the Further Exploration Review the Fortinet Product Life Cycle for official dates on all "D" series devices. Fortinet Upgrade Path Tool End of Support (EOS) : The FortiGate 200D
Step-by-step upgrade (concise)