Firmware Upgrade and Downgrade
Before any firmware upgrade or downgrade, save a copy of your FortiMail configuration by going to Dashboard > Status and click Backup in the System Information widget.
After any firmware upgrade or downgrade, if you are using the web UI, clear the browser cache prior to login on the FortiMail unit to ensure proper display of the web UI screens. Also go to verify that the build number and version number match the image loaded.
The antivirus signatures included with an image upgrade may be older than those currently available from the Fortinet FortiGuard Distribution Network (FDN). Fortinet recommends performing an immediate AV signature update as soon as possible.
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Firmware downgrading is not recommended and not supported in general. Before downgrading, consult Fortinet Technical Support first. |
Upgrade path
6.0.5 (build 148) > 6.2.4 (build 272) > 6.4.5 (build 453) > 7.0.6 (build 216) > 7.2.7 (build 421)
Firmware downgrade
Downgrading to previous firmware versions results in configuration loss on all models. Only the following settings are retained:
- operation mode
- interface IP/management IP
- static route table
- DNS settings
- admin user accounts
- admin access profiles