Su sito dicono di fare così:
How do I uninstall the startup firewall created by BrickHouse?
In the BrickHouse application, click the lock to authorize. Select 'Remove Startup Script' under the Options menu, or throw out the Firewall folder at /Library/StartupItems/Firewall, and reboot your Macintosh. You could also use the BrickHouse application and 'Clear All Rules' instead of rebooting to uninstall the firewall temporarily.
Prova... se non dovesse funzionare ti consiglio di fare tutto a mano