1.) Make sure your conf register is 0x2102

Do show version and at the very end of the output you will see the Configuration register. 

show version

Configuration register is 0x2102
 

If the config register is not 0x2102 then enter this command:

r1#configure terminal
r1(config)#config-register 0x2102
r1(config)#end

2.) Let's Erase the NVRAM/flash config settings

As below you'll just enter the "write erase" command and type "reload" and hit enter.

Once you hit reload the router will reboot and will no longer have the current-running config and will be factory defaulted.

r1#write erase
Erasing the nvram filesystem will remove all configuration files! Continue? [confirm]
[OK]
Erase of nvram: complete
r1#reload

Proceed with reload? [confirm]

System Bootstrap, Version 15.0(1r)M1, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 2009 by cisco Systems, Inc.

Total memory size = 512 MB - On-board = 512 MB, DIMM0 = 0 MB
CISCO2901/K9 platform with 524288 Kbytes of main memory
Main memory is configured to 72/-1(On-board/DIMM0) bit mode with ECC enabled


Readonly ROMMON initialized
program load complete, entry point: 0x80803000, size: 0x1b340
program load complete, entry point: 0x80803000, size: 0x1b340


IOS Image Load Test
___________________
Digitally Signed Release Software
program load complete, entry point: 0x81000000, size: 0x3ba8f3c
Self decompressing the image : ################################################################################################################################################################################################################################################################################################################################################################################ [OK]

Smart Init is enabled
smart init is sizing iomem
                 TYPE      MEMORY_REQ
    Onboard devices &
         buffer pools      0x0228F000
-----------------------------------------------
               TOTAL:      0x0228F000

Rounded IOMEM up to: 36Mb.
Using 7 percent iomem. [36Mb/512Mb]

              Restricted Rights Legend

Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software - Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.

           cisco Systems, Inc.
           170 West Tasman Drive
           San Jose, California 95134-1706



Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.0(1)M1, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Wed 02-Dec-09 15:23 by prod_rel_team
Image text-base: 0x21008F18, data-base: 0x258D4640


This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

Installed image archive
Cisco CISCO2901/K9 (revision 1.0) with 487424K/36864K bytes of memory.
Processor board ID FTX1337Y536
2 Gigabit Ethernet interfaces
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity enabled.
255K bytes of non-volatile configuration memory.
254464K bytes of ATA System CompactFlash 0 (Read/Write)


         --- System Configuration Dialog ---

Would you like to enter the initial configuration dialog? [yes/no]: noEnjoyr

 

3.) Configure Your Router As Needed

Enjoy your fresh factory default Cisco device now :).

You can either hit yes or no above, but if you are experienced you likely want to hit no and configure everything as required.

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