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.
You should see this ROMmon prompt:
rommon 2> confreg 0x2142
rommon 3> reset
The prompt changes to Router#, indicating that the router is now in privileged mode.
You should now see a Router(config)# prompt.
Router (config)# config-register 0x2102
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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