To reset a Cisco router to factory default (removing the startup configuration file), perform these steps:
| 1. | To erase the configuration file, issue the erase nvram: command.
Reload the router by issuing the reload command. |
| 2. | If this does not solve the problem, attempt to break into ROM Monitor (ROMmon) by issuing the break sequence (usually Ctrl and break from the Hyperterminal) from a console connection.
Refer to: Cisco Standard Break Key Combinations You should see this ROMmon prompt:
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| 3. | Change the configure register value to ignore the startup configuration by issuing the confreg command, as shown in this example:
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| 4. | To reload the router, issue the reset command, as shown in this example:
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| 5. | After the router boots, issue the enable command at the Router > prompt.
The prompt changes to Router#, indicating that the router is now in privileged mode. |
| 6. | To enter config mode, issue the config terminal command.
You should now see a Router(config)# prompt. |
| 7. | To change the configure register to recognize the startup configuration, issue the config-register command, as shown in this example:
To break out of configuration mode, press Cntl and Z. To save the blank configuration, issue the copy-running config-startup config command. |
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