installing firewall without block device

  • Hello,

    one of the features of Firewall Builder described in the site is:

    "To help avoid situations where a firewall change accidentally blocks access to the device, Firewall Builder includes functions to automatically revert a firewall configuration to the previous version. "

    Where I find such functions to prevent a device block after a installation? The only thing I found was always allow access by management workstation, but not a function to automatically revert the firewall to a previous version .

    Thanks in advance.

    Rickifer Barros.