upgrade IOS

verify flash:c2600-adventerprisek9-mz.124-12.bin

Verifying file integrity of flash:c2600-adventerprisek9-mz.124-12.bin...........
................................................................................

................................................................................
.............................Done!
Embedded Hash MD5 : 1988B2EC9AFAF1EBD0631D4F6807C295
Computed Hash MD5 : 1988B2EC9AFAF1EBD0631D4F6807C295
CCO Hash MD5 : 141A677E6E172145245CCAC94674095A

Signature Verified
Verified flash:c2600-adventerprisek9-mz.124-12.bin

show run | include boot
boot system flash:c2600-adventerprisek9-mz.123-21.bin

2600#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
2600(config)#no boot system
2600(config)#boot system flash:c2600-adventerprisek9-mz.124-12.bin
2600(config)#^Z

IOS image in the slot1—The boot variable that points to the old Cisco IOS needs to be removed first, and then the router needs to be configured to boot through the new Cisco IOS.

3600# show run | include boot
boot system slot1:c3640-i-mz.120-22.bin

3600#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
3600(config)#no boot system
3600(config)#boot system slot1:c3640-i-mz.122-7b.bin
3600(config)#^Z

Step 10: Save the Configuration and Reload the Router

Save the configuration, and reload the Router.

2600# write memory
2610# reload
Proceed with reload? [confirm]
Jan 24 20:17:07.787: %SYS-5-RELOAD: Reload requested by console. Reload Reason:
Reload Command.

Step 11: Verify the Cisco IOS Upgrade

Verify that the router runs with the proper image.

After the reload is complete, the router should run the desired Cisco IOS Software image. Use the show version command in order to verify the Cisco IOS software.

2600#show version
00:22:25: %SYS-5-CONFIG_I: Configured from console by console
Cisco IOS Software, C2600 Software (C2600-ADVENTERPRISEK9-M), Version 12.4(12),
RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2006 by Cisco Systems, Inc.
Compiled Fri 17-Nov-06 11:18 by prod_rel_team