You should typically aim for the latest patch release in the 6.0 branch (e.g., FortiOS 6.0.18).
The final stable firmware release for the FortiGate 200D is . fortigate 200d latest firmware updated
Even though it has reached its software limit, many 200D units still serve faithfully in environments where high-speed 10Gbps interfaces aren't required. However, with hardware support winding down, many teams are now looking toward trade-up programs to migrate to the F-series for better performance and the latest security features. Are you planning to perform this upgrade yourself, or You should typically aim for the latest patch
Solved: 200D firmware update path? - the Fortinet Community! However, with hardware support winding down, many teams
: The 200D provides up to 4 Gbps of firewall throughput, which is still respectable for internal segmentation but lacks the hardware acceleration (like NP6XLite) found in modern "F" or "G" series models. Upgrade Considerations Legacy (200D) Modern (e.g., 200F) Max OS FortiOS 6.0.x (EOL) FortiOS 7.6.x (Mature) Security Critical patches only; no new features Full FortiGuard AI/ML support Hardware Older purpose-built processors NP6/CP9 Hardware Acceleration Recommended Use Lab environments or simple internal routing Production edge firewall Best Practices for 200D Updates If you are still managing a