Cisco ASA: Reset password

1. Turn off appliance
2. Connect console cable
3. Interrupt boot process by pressing ESC to enter ROMMON-Mode (ROM Monitor Mode):

rommon #0>

View current config

rommon #0>confreg

Change Config-Register to 0x41

rommon #1>confreg 0x41
rommon #2>boot
asa>

Change password and reload

asa> enable
asa# copy startup-config running-config
asa# configure terminal
asa(config)# enable password cisco
asa(config)# username admin password cisco
asa(config)# config-register 0x01
asa(config)# exit
asa# write memory
asa# reload