Password Recovery Procedure
To recover passwords for the ASA, perform the following steps:
Step 1 
Connect to the ASA console port according to the instructions in "Accessing the Command-Line Interface" section.
Connect to the ASA console port according to the instructions in "Accessing the Command-Line Interface" section.
Step 2 Power off the ASA, and then power it on.
Power off the ASA, and then power it on.
Step 3 After startup, press the Escape key when you are prompted to enter ROMMON mode.
After startup, press the Escape key when you are prompted to enter ROMMON mode.
Step 4 To update the configuration register value, enter the following command:
To update the configuration register value, enter the following command:rommon #1> confreg 0x41
Update Config Register (0x41) in NVRAM...
Step 5 To set the ASA to ignore the startup configuration, enter the following command:
To set the ASA to ignore the startup configuration, enter the following command:rommon #1> confreg
The ASA displays the current configuration register value, and asks whether you want to change it:
Current Configuration Register: 0x00000041
Configuration Summary:
boot default image from Flash
ignore system configuration
Do you wish to change this configuration? y/n [n]: y
Step 6 Record the current configuration register value, so you can restore it later.
Record the current configuration register value, so you can restore it later.
Step 7 At the prompt, enter Y to change the value.
At the prompt, enter Y to change the value.
The ASA prompts you for new values.
Step 8 Accept the default values for all settings. At the prompt, enter Y.
Accept the default values for all settings. At the prompt, enter Y.
Step 9 Reload the ASA by entering the following command:
Reload the ASA by entering the following command:rommon #2> boot
Launching BootLoader...
Boot configuration file contains 1 entry.
Loading disk0:/asa800-226-k8.bin... Booting...Loading...
The ASA loads the default configuration instead of the startup configuration.
Step 10 Access the privileged EXEC mode by entering the following command:
Access the privileged EXEC mode by entering the following command:hostname> enable
Step 11 When prompted for the password, press Enter.
When prompted for the password, press Enter.
The password is blank.
Source :
https://supportforums.cisco.com/document/79016/asa-password-recovery#Password_Recovery_Procedure
Source :
https://supportforums.cisco.com/document/79016/asa-password-recovery#Password_Recovery_Procedure
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