How to break Router's Password

Hi guys this topic is just for the understanding that in a critical condition when we wont be able to log in into our router we can use this method to get into it.

Router has basically 2 register mode
i) 0x2102 (Default mode)
ii) 0x2142 (troubleshoot mode)

Troubleshoot mode is basically the alternative method to dig into the router and this need a physical access with physical access we cant break the password of router.

Steps:

1. Restart the router(during restart process it goes to default mode and we have to stop it)
2. So in second step we use ctrl+pause/break button to avoid the default register mode.
3. Use command "confreg 0x2142" (this command is used to configure the register mode).
4. It will show the "rommon 2>" mode, here just use reset command.
5. Now the router will restart and open in 0x2142 mode.

It now asks for initial configuration just type NO.

Again use the commands like:

router>enable
router>show version
router>config t
here we are going to change the register mode
router(config)>config-register 0x2102
router(config)>line console 0
router(config)>no pass(it will not ask for the password)
router(config)>exit
router>exit
router>wr(for building configuration)

Now the router have no password.