Step1) Power cycle the router
Step2) CTRL + Break (during bootup)
Step3) change Configuration register number
rommon 1> confreg
do you wish to change the confiugration y/n : n
rommon 2> confreg 0x2142 You must reset or power cycle for new config to take efect romon 3> reset
//after reboot
Would you like to enter the initial configuration dialog? [yes/no]: n Router> enable Router# copy startup running
RouterName# conf t RouterName(config)# enable secret EnterYourNewPassword! RouterName(config)# do copy runn startup RouterName(config)# config-register 0x2102 RouterName(config)# do show version
show version command displays curent Configuration register number (at the very end of the line)
RouterName(config)# do reload
Reset password for Cisco 3750G Layer 3 Switch
During boot, PRESS and hold MODE button for 30 SEC
switch: flash_init
See existing contents of flash memory
dir flash:
Rename existing config.text to config.old.text
rename flash:config.text flash:config.old.text
Boot to restart the switch without config
boot
Would you like to terminate autoinstall [yes]:
Press ENTER to skip
Would you like to enter the initial configuration dialog? [yes/no]
no
Go to enable mode
enable
Copy old config to running-config
copy flash:config.old.text running-config
Go to global configuration mode and change password
Switch#conf t Switch(config)#enable password cisco Switch(config)#enable secret cisco
Change password for existing user kim
Switch(config)#username kim password NewPassWordHere
Create new user kim
username kim secret NewPassWordHere
Finally save and reload
Switch(config)#do wr Switch#reload