View source for Delete / Erase / Change Password for the Cisco 2000, 2500, 3000, 4000, AccessPro, 7000 (RP), AGS, IGS, and STS-10x

'''Step 1:''' Hit '''ctrl / break''' directly after powering up the router. 
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'''Step 2:''' Type '''o''', press '''ENTER''', and record the current value of the configuration register (usually 0x2102 or 0x102).
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'''Step 3:''' Type '''o/r 0x2142''',and press '''ENTER'''
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'''Step 4:''' Type '''i''' , the router will reboot but ignores the saved configuration.
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'''Step 5:''' Would you like to enter the initial configuration dialog? [yes/no]: answer '''''NO''''' 
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'''Step 6:''' Type '''enable''' at  Router>
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'''Step 7:'''Type '''configure memory or copy startup-config running-config'''.
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'''Step 8:''' Type '''show running-config'''.
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'''Step 9:''' Type '''configure terminal''' to change or remove the password from the router.
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'''Step 10:''' Type '''enable secret <password>''' in order to change the enable secret password or type '''NO ENABLE SECRET''' to remove the secret from router(config)#> 
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'''Step 11''': type: '''''NO ENABLE PASSWORD''''' to remove the password from router (config)#>
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'''Step 12:''' Type the '''no shutdown''' command on every interface that you use.
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'''Step 13:''' Type '''config-register <configuration_register_setting>.''' For example: hostname(config)#config-register 0x2102 .
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'''Step 14:''' Hit '''Ctrl / z''' or '''end''' to leave the configuration mode.
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'''Step 15:''' Type ''' write memory''' or '''copy running-config startup-config ''' to save the changes.
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'''Step 16:''' Type '''Reload'''