Explain the between "Feature" and "Mature" firmware. Troubleshoot a failed checksum or download issue. What is your current FortiGate model and firmware version ?

| Step | Action | Verification Point | |------|--------|--------------------| | 1 | Log into official Fortinet Support Portal | SSL certificate check | | 2 | Navigate to | Ensure URL is *.fortinet.com | | 3 | Select correct model and version | Compare with release notes | | 4 | Download firmware + checksum/signature file | Save both locally | | 5 | Compute SHA-256 hash | sha256sum firmware.out | | 6 | Compare with Fortinet’s hash | String match required | | 7 | (Optional) Verify GPG signature | Trust chain validation |

: Always check the Release Notes for your specific model, as some older hardware (like the 60C) is capped at much older versions (e.g., FortiOS 5.2).