Reverting

The following procedure reverts the FortiGate unit to its factory default configuration and deletes any configuration settings. If you are reverting to a previous FortiOS version, you might not be able to restore the previous configuration from the backup configuration file.

Always remember to back up your configuration before making any changes to the firmware.

To revert to a previous firmware version - GUI:

1. Log into the GUI as the admin user.
2. Go to System > Firmware
3. Under Upload Firmware, select Browse and locate the firmware image file.
4. 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.

To revert to a previous firmware version - CLI:

Before beginning this procedure, it is recommended that you:

• Backup the FortiGate unit system configuration using the command
  execute backup config.
• Backup the IPS custom signatures using the command execute
backup ipsuserdefsig.
• Backup web content and email filtering lists.

To use the following procedure, you must have a TFTP server the FortiGate unit can connect to.

1. Make sure the TFTP server is running.
2. Copy the firmware image file to the root directory of the TFTP server.
3. Log into the FortiGate CLI.
4. Make sure the FortiGate unit can connect to the TFTP server by using the execute ping command.
5. Enter the following command to copy the firmware image from the TFTP server to the FortiGate unit: execute restore image tftp <name_str> <tftp_ipv4>

6. The FortiGate unit responds with this message:

   This operation will replace the current firmware version!

   Do you want to continue? (y/n)

7. Type y. The FortiGate unit uploads the firmware image file. After the file uploads, a message similar to the following appears:

   Get image from tftp server OK.
   

   Check image OK.

   This operation will downgrade the current firmware version!
   

   Do you want to continue? (y/n)

8. 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.
9. Reconnect to the CLI.
10. To restore your previous configuration, if needed, use the command: execute restore config <name_str> <tftp_ipv4>
11. Update antivirus and attack definitions using the command: execute update-now