Cisco ISR password recovery

[SS2020]

Hello All,

i have a Cisco ISR router model 4321 and need to do lost password recovery but every time i follower below steps i lose current configurations.

Cisco Router password recovery step by step
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Step one,get into the rommon mode by breaking into the rommon moode during the bootup.
after you into the rommon mode, change the register configuratiobs, 0x2142 as below

rommon 1 > confreg 0x2142
!
Step2, reset the router
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rommon 2 > Reset
!

Step 3,Skip Initial Configuration Dialog:
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Would you like to enter the initial configuration dialog? [yes/no]: no
!

Step 4,Skip Initial Configuration Dialog:
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Enter Privileged EXEC Mode:
Router> enable
Router# copy startup-config running-config

Step 5,change the password,
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Router# configure terminal
Router(config)# enable secret NEW_PASSWORD
Router(config)# exit

Step 6,Change Configuration Register Back:
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Router# configure terminal
Router(config)# config-register 0x2102
Router(config)# exit


Step 6,Change Configuration Register Back:
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Router# write memory
Router# reload

can someone kindly help me to show me how to replace a lost username and password recovery without losing the current configurations please? i cannot afford to lose running configurations on the route as i do not have a backup. 

Many thank you.

[balaji.bandi · Accepted solution]

i follow most of the time works for me :

https://www.cisco.com/c/en/us/td/docs/routers/access/4400/troubleshooting/guide/isr4400trbl/isr4400trbl02.html

when you are in #you can copy the config show run (to notepad) and save out of box, also make sure you make regular backup to avoid loosing the woprking config.

[KBMTech]

This is not working for me. I can try all day long and it will always boot to username: .

I entered rommon>1 and typed confreg 0x2142 and reset. The router reset and booted all the way to username: time after time.

I then tried https://www.cisco.com/c/en/us/td/docs/routers/access/4400/troubleshooting/guide/isr4400trbl/isr4400trbl02.html but get the same result. I have done this before and never had a problem, now on the last three 4351 ISR's I am experiencing the same symptoms, not able to log in to exec mode

Any help is appreciated.

[balaji.bandi]

I suggest to open a new post referring this post and post complete boot log on the new post so we can understand what is the issue.