How to reset the Cisco 3900 to factory defult

Cisco 3900 Series Integrated Services Routers (ISR) are designed to meet the application demands of today's medium-to-large branches and to evolve to cloud-basedservices. All Cisco 3900 Series Integrated Services Routers (ISR) have modular design that allows for reuse of a broad array of existing modules that meet business requirements while maximizing investment protection. Among all Cisco 3900 router, CISCO3925/K9 and CISCO3945/K9 are best selling models.

To reset the Cisco 3900 to factory default (removing the startup configurationfile), 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:

rommon 1>

3. Change the configure register value to ignore the startup configuration by issuing the confreg command, as shown in this example:

rommon 2> confreg 0x2142

4. To reload the router, issue the reset command, as shown in this example:

rommon 3> reset

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:

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 configcommand.

Hope can help you to reset the Cisco 3900 to factory defult. If it doesn’t work,you can refer to the www.cisco.com for more about the Cisco 3900.

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