Cisco ASA 55XX Password Recovery Process:
1.
Power cycle the ASA by unplugging and plugging
back in the power adapter.
2.
While
restarting, press ESC or Break to enter the ROM Monitor mode. prompt should
look like (rommon#0)
3.
Enter command confreg. This will show the current configuration register, which
should be 0×00000001. Say NO to
change prompt.
4.
Change configuration register to 0×41 to ignore the Startup-configuration
on boot. To do this please type (rommon#1)
confreg 0×41
5.
Reboot the ASA with (rommon#2) boot
command.
6.
ASA will
reboot and show the default prompt ciscoasa>
7.
Do
ciscoasa>enable and press Enter.
8.
Press Enter. (Password is blank)
9.
You should be in privileged mode ciscoasa#
10.
Run ciscoasa# copy start run
11.
Destination File name [running-conf ig]
12.
Enter the ASA configuration mode. ciscoasa# config terminal
13.
Now set the new password of your choice.
ciscoasa(conf ig) # enable password
14.
Change configuration register back to 0×00000001
to boot from startup-config.
ciscoasa(conf ig) # config-register 0×01
ciscoasa(conf ig) # config-register 0×01
15.
Save the running-config to startup-config.
ciscoasa# copy run start
16.
Reload the ASA. ciscoasa# reload
