Cannot clear configuration

[TSupportEngineer]

Hi all, hoping you can help. I have a 2511 I picked up for use in my lab. I am unable to clear the present configuration even after using the "Setup" command. After changing the configuration and saving it, a certain time period passes and if I "sho run", the configuration comes back, printing out some errors and returning the original.
The router has been set up for automatic dialing and has a notation about "chat script", which I cannot find in any IOS book I have to remove that either. The configuration also times out and I cannot seem to remove the exec-timeout, if that is what it is, as it is not shown in the configuration (that I can see). The present configuration follows. I am not worried about the partitioned flash, as I have repartitioned flash before, so I am familiar with that.
Thanks in advance for any help you may be able to give.

TSupportEngineer

Current configuration:
!
version 11.1
service udp-small-servers
service tcp-small-servers
!
hostname Termserver
!
!
partition flash 2 8 8
!
no ip routing
chat-script cisco-default ABORT ERROR "" "AT Z" OK "ATDT \T" TIMEOUT 30 \c CONNE
CT \c
!
interface Ethernet0
no ip address
no ip mroute-cache
no ip route-cache
no keepalive
shutdown
bridge-group 1
!
interface Serial0
no ip address
no ip mroute-cache
no ip route-cache
shutdown
no fair-queue
!
interface Serial1
no ip address
no ip mroute-cache
no ip route-cache
shutdown
!
no ip classless
bridge 1 protocol dec
!
line con 0
line 1 11
script dialer cisco-default
modem InOut
autocommand telnet 204.208.71.73
transport input all
stopbits 1
flowcontrol hardware
line 12
session-limit 1
script dialer cisco-default
modem InOut
transport input all
stopbits 1
flowcontrol hardware
line 13
script dialer cisco-default
modem InOut
autocommand telnet 204.208.71.73
transport input all
stopbits 1
flowcontrol hardware
line 14 16
no exec
session-limit 1
script dialer cisco-default
no vacant-message
modem InOut
transport input all
telnet transparent
stopbits 1
flowcontrol hardware
line aux 0
line vty 0 4
no login
!
end

Termserver

 

[jcombee]

Just type "write erase" and then "enter" wil do the trick,
then a "reload" and the router wil start up presenting the setup script. Remember to do this wil the cisco rollover cable on the console port, as the router will come up without ip configuration and all interfaces shutdown.

 

[TSupportEngineer]

Thanks, jcombee, that's one commmand I tend not to think about. Actually had to use erase startup-config, and still had to configure the asynch lines separately, but you got me on the right track. Thanks again! TSupportEngineer