Delete / Erase / Change Password for the Cisco 806, 826, 827, 828, 831, 836, and 837 Series Routers

Step 1: Hit ctrl / break directly after powering up the router.

    If the break sequence does not work, refer to Standard Break Key Sequence Combinations During Password Recovery 
    for other key combinations. 

Step 2: type: confreg 0x2142 from rommon 1>

Step 3: type: reset from rommon 2>

Step 4: Would you like to enter the initial configuration dialog? [yes/no]: answer NO

Step 5: Type enable at Router>

Step 6:Type configure memory or copy startup-config running-config.

Step 7: Type show running-config.

Step 8: Type configure terminal to change or remove the password from the router.

Step 9: Type enable secret <password> in order to change the enable secret password or type NO ENABLE SECRET to remove the secret from router(config)#>

Step 10: type: NO ENABLE PASSWORD to remove the password from router (config)#>

Step 14: Type the no shutdown command on every interface that you use.

Step 12: Type config-register <configuration_register_setting>. For example: hostname(config)#config-register 0x2102 .

Step 13: Hit Ctrl / z or end to leave the configuration mode.

Step 14: Type write memory or copy running-config startup-config to save the changes.