Fortinet FortiGate FortiGate-200A

FortiGate Firmware Reverting to a previous firmware version
FortiGate-200A, FortiGate-300A, FortiGate-400A, and FortiGate-500A FortiOS 3.0 MR4 Install Guide
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5 Enter the following command to copy the firmware image from the TFTP server to
the FortiGate unit:
execute restore image <name_str> <tftp_ipv4>
Where <name_str> is the name of the firmware image file and <tftp_ip> is
the IP address of the TFTP server. For example, if the firmware image file name is
v280image.out and the IP address of the TFTP server is 192.168.1.168, enter:
execute restore image v2.80image.out 192.168.1.168
The FortiGate unit responds with this message:
This operation will replace the current firmware version!
Do you want to continue? (y/n)
6 Type y.
The FortiGate unit uploads the firmware image file. After the file uploads, a
message similar to the following is displayed:
Get image from tftp server OK.
Check image OK.
This operation will downgrade the current firmware version!
Do you want to continue? (y/n)
7 Type y.
The FortiGate unit reverts to the old firmware version, resets the configuration to
factory defaults, and restarts. This process takes a few minutes.
8 Reconnect to the CLI.
9 To confirm the new firmware image has been loaded, enter:
get system status
10 To restore your previous configuration, if needed, use the command:
execute restore config <name_str> <tftp_ip4>
11 Update antivirus and attack definitions.
For information, see the FortiGate Administration Guide, or from the CLI, enter:
execute update-now.