Given that the "latest firmware" is effectively frozen in time, you should plan a migration. Here are realistic replacements:
The reached its technical zenith several years ago, with the final stable firmware version being FortiOS 6.0.16 . Since this model is now officially past its End of Service Life (EOSL) as of May 22, 2023, it no longer receives security patches or engineering updates. fortigate 200d latest firmware