Cisco WAN :: Unable To Change Username And Password On 2800?

I have tried to change the username and password using the following procedure but when I do so and reboot the router and try to login using the new userid and password it says Authentication failed. Complete these steps in order to recover your password:Shut down the router.Remove the compact flash that is at the back of the router.Power on the router.Once the Rommon1> prompt appears, enter this command:confreg 0x2142Insert the compact flash.Type reset.when you are prompted to enter the initial configuration, type No, and press Enter.At the Router> prompt, type enable.At the Router# prompt, enter the configure memory command, and press Enter in order to copy the startup configuration to the running configuration.Use the config t command in order to enter global configuration mode.Use this command in order to create a new user name and password:router(config)#username cisco privilege 15 password ciscoUse this command in order to change the boot statement:config-register x2102Use this command in order to save the configuration:write memoryReload the router, and then use the new user name and password to log in to the router.