hardware, while capable, lacks the necessary RAM and CPU power to effectively run the newer, more advanced inspection engines found in FortiOS 6.4, 7.0, or 7.2.
Always use Fortinet's official Upgrade Path Tool on their support site ( support.fortinet.com ). This tool will give you a specific, step-by-step path to follow based on your exact current firmware version. fortigate 200d latest firmware extra quality