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System status Revert to a previous firmware version
FortiGate-100 Installation and Configuration Guide 73
1 Copy the firmware image file to your management computer.
2 Login to the FortiGate web-based manager as the admin administrative user.
3 Go to System > Status.
4 Select Firmware Upgrade .
5 Enter the path and filename of the previous firmware image file, or select Browse and
locate the file.
6 Select OK.
The FortiGate unit uploads the firmware image file, reverts to the old firmware version,
resets the configuration, restarts, and displays the FortiGate login. This process takes
a few minutes.
7 Login to the web-based manager.
For information about logging into the web-based manager when the FortiGate unit is
set to factory defaults, see “Connecting to the web-based manager” on page 30.
8 Go to System > Status and check the Firmware Version to confirm that the firmware
has been installed successfully.
9 Restore your configuration.
See “Restoring system settings” on page 84 to restore your previous configuration.
10 Use the procedure “Manually updating antivirus and attack definitions” on page 95 to
update antivirus and attack definitions.
Reverting to a previous firmware version using the CLI
This procedure reverts your FortiGate unit to its factory default configuration and
deletes NIDS user-defined signatures, web content lists, email filtering lists, and
changes to replacement messages.
Before running this procedure you can:
• Backup the FortiGate unit configuration using the command execute backup
config.
• Backup the NIDS user defined signatures using the command execute backup
nidsuserdefsig
• Backup web content and email filtering lists, see the FortiGate Content Protection
Guide.
If you are reverting to a previous FortiOS version (for example, reverting from FortiOS
v2.50 to FortiOS v2.36) you may not be able to restore your previous configuration
from the backup configuration file.
Note: Installing firmware replaces your current antivirus and attack definitions with the
definitions included with the firmware release that you are installing. When you have installed
new firmware, use the procedure “Manually updating antivirus and attack definitions” on
page 95 to make sure that antivirus and attack definitions are up-to-date.