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Password Break of Cisco Router

Create a consol connection with the default setting

When its booting the IOS then hit "Ctrl+Break"
Then it will go to the ROMON Mode. it looks like

Romon>help

You need to change the register value. to see the register value

Romon>show version

originally the configuration register is 0x2102. To change the register value to 0x2142

Romon> confreg 0x2142

Then Restart the router

rommon> reset

The router now will restart and ask you if you want to use the setup mode and of course you will say no.
Now, in order not to loose the configuration that you already have in the router,

Router>enable
Router#copy start run
Router#configure terminal
Router(config)#enable secret abcd123

And you can also put new console and telnet passwords if you like. Click Here

To get things going back to normal, change the value of the configuration register to its original form (0x2102)
using the following global configuration command:

Router(config)#config-register 0x2102

Save the configuration including the new passwords that you know:

Router#copy run start

Then Restart the router

Router#reload

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