to factory in asa 5505

1. config t
2. config factory-default
3. type reload save-config noconfirm
4. make sure that the outside line is plugged into port zero, and your pc is plugged into any of the ports 1-7.
5. The Cisco ASA has been reset to factory settings. DHCP is enabled on the cisco device, and it’s internal IP address is now 192.168.1.1!