Downgrading to previous firmware versions
FortiManager does not provide a full downgrade path. You can downgrade to a previous FortiManager firmware release via the Web-based Manager or CLI. A system reset is required after the firmware downgrading process has completed.
| All configuration will be lost after downgrading the device. For FortiManager devices with hard drives installed, the hard drives will be formatted. |
To re-initialize a FortiManager use the following CLI commands via a console port connection:
execute reset all-settings
execute format {disk | disk-ext4}