Here's how I did it:
Connect Putty (or equivalent) to the console and boot the unit
As it boots you will see something like the entry below.
Press ESC when you see this:
Use BREAK or ESC to interrupt boot.
You'll be taken to the rommon #0> prompt
enter
confreg 0x41
Update Config Register (0x41) in NVRAM...
confreg
You'll see the following show up with some questions
Current Configuration Register: 0x00000041
Do you wish to change this configuration? y/n [n]: Y
enable boot to ROMMON prompt? y/n [n]: Y
select specific Flash image index? y/n [n]: Y
enter Flash image index [1->7]: 1
disable system configuration? y/n [n]: Y
go to ROMMON prompt if netboot fails? y/n [n]: Y
enable passing NVRAM file specs in auto-boot mode? y/n [n]: Y
disable display of BREAK or ESC key prompt during auto-boot? y/n [n]: Y
You'll come up to a ROMON prompt
BOOT
once unit is booted
ciscoasa> enable
no password, just press enter
ciscoasa# copy startup-config running-config
ciscoasa# configure terminal
Would you like to enable anonymous error reporting to help improve
the product? [Y]es, [N]o, [A]sk later: N
ciscoasa(config)# password passwordciscoasa(config)# enable password password
ciscoasa(config)# username cisco password password
ciscoasa(config)# no config-register
ciscoasa(config)# copy running-config startup-config
ciscoasa(config)# config factory-default
Factory-default configuration is completed
PowerCycle the unit and you'll be taken to the 'ciscoasa' prompt and can proceed with regular configurations.
