There is script in the csf directory for doing the same simply. You can uninstall the CSF firewall utility by running the ‘uninstall.sh’ script from command line.
Step I : Login to your server via SSH as root user.
Step II : Change the directory to ‘/etc/csf’
# cd /etc/csf
You can find out this file under the directory /etc/csf.
uninstall.sh -> /usr/local/csf/bin/uninstall.sh
Step III : Execute the following command.
# sh uninstall.sh Or # /usr/local/csf/bin/uninstall.sh