How to Reset Cisco 2600 Router to Factory Defaults

To reset your Cisco 2600 router, just follow the instructions from this link.

If you forgot your router's password (enable password, enable secret, console) you need to reset your router through ROMmon.

To access the ROMmon mode, start your minicom and reboot your router. Upon booting send the CTR+BREAK sequence by pressing CTRL-A F on your keyboard.

System Bootstrap, Version 12.2(8r) [cmong 8r], RELEASE SOFTWARE (fc1)               
Copyright (c) 2003 by cisco Systems, Inc.                                           
C2600 platform with 98304 Kbytes of main memory

program load complete, entry point: 0x80008000, size: 0xacc0f0
Self decompressing the image : ########################
monitor: command "boot" aborted due to user interrupt
rommon 1 > 
rommon 1 > 

Then type this command to change the router's configuration register to 0x2142.

rommon 1 > confreg 0x2142

You must reset or power cycle for new config to take effect

rommon 2 > reset

You can now login to the router without password. Configure your router again and set your password.

Router#config terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#enable secret secretpassword

Then change your configuration register to its default value 0x2102

Router(config)#config-register 0x2102

Verify your configuration register if its set to its default value. Issue this command.

Router#sh ver

You will see the configuration register value below.

Cisco Internetwork Operating System Software 
IOS (tm) C2600 Software (C2600-IK8O3S-M), Version 12.2(24a), RELEASE SOFTWARE (fc3)
Copyright (c) 1986-2004 by cisco Systems, Inc.
Compiled Fri 28-May-04 20:34 by pwade
Image text-base: 0x8000808C, data-base: 0x812D11C0

ROM: System Bootstrap, Version 12.2(8r) [cmong 8r], RELEASE SOFTWARE (fc1)

Router uptime is 9 minutes
System returned to ROM by power-on
System image file is "flash:c2611.bin"

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cisco 2611XM (MPC860P) processor (revision 0x200) with 93184K/5120K bytes of memory.
Processor board ID JAE080309QM (770573440)
M860 processor: part number 5, mask 2
Bridging software.
X.25 software, Version 3.0.0.
2 FastEthernet/IEEE 802.3 interface(s)
32K bytes of non-volatile configuration memory.
32768K bytes of processor board System flash (Read/Write)
Configuration register is 0x2102