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Follow this to learn how to upgrade an ios on a Cisco Router or Catalyst Switch.

Cisco Upgrade IOS Configuration Steps

1. LAPTOP: Download TFTP server and verify you know how to use it.

2. Point your directory to the folder where your image is located(see above)

3. Connect Serial or USB to Rollover cable

4. Configure Hyperterminal or Securecrt to :8,9600,none,1

5. Click okay or accept the settings on your terminal emulator

6. Console into switch or router with blue rollover cable

7. Username/ Password prompt: Type proper credentials  <enter> and then Type: enable <enter>

8. At the Enable Password prompt: Type proper credentials  <enter>

Note:  Step 9 through 11 are ONLY if you are trying to access a

NM catalyst switch module onboard a Cisco Router. 

If this is not the case then skip the steps 9 through 11.   i.e. Start back on step 12.

9. Once you are at the # prompt type: service-module g1/0 session <enter>

10.  Username/ Password prompt: Type proper credentials  <enter>  

and then Type: enable <enter> (This step only for NM-switch if not skip to step 12)

11. At the Enable Password prompt: Type proper credentials  <enter>

 (This step only for NM-switch if not skip to step 12)

12. configure terminal <enter>

13. interface Fast ethernet switch/slot/port and in our case: interface fastethernet 1/0/1

<enter> (in our case this port value, yours might be different, i.e- int G0/2)

14. no switchport <enter>

15. ip address ip address/subnet mask ip address 10.10.10.2 255.255.255.0

(your choice of ip addresses, as this is temporary)

16. type no shutdown <enter>

17. end <enter>

18. type wr <enter>

See Below Image:

19. LAPTOP: Configure your own network adapter on your laptop:  make your laptops ip

address 10.10.10.1 /24 and connect your laptop to the port mentioned above.

20. Then try to ping the the ip on the switchport that you configured above (the .2 address)

NOTE:  If you try to ping your Laptop from your Switch it might not work...

( Think, think)  ! Your Laptop's firewall will many times deny pings.

21. If successful then continue- otherwise retry..

22. show flash: <enter>

23. Is the present image in a folder or not and make note (adjust accordingly)? 

In this case it is in a folder; please notice that it is small in size like a folder will be

(line 4) it also does not end in .bin

24. copy tftp flash<enter>

25. Then type the ip address of the switches interface in this case .1 <enter>

26. Type or paste the file name in next, including the .bin portion of the name <enter>

27. If you are seeing !!!!!!!!!!!!!!!!!!!!!! ß these bangs then you are doing great.

Wait until they stop and you will get a successful message next.  It will look like this:

28. Please notice that the file is line 5 in this case and it is large in size.  You can see the name of the file

and the .bin at the end of the name as the extension.

(If it does not look like this then DO NOT PROCEED) you will break the device.

29. Now you can delete the old file with this command:

delete flash:c3750-ipbase-mz.122-35.SE5/c3750-ipbase-mz.122-35.SE5.bin <enter>

This will delete the file and folder of the old IOS forcing it to boot to the new one.

30. OR  One can command the Switch to Load the new file, leaving the old file there if you have the space as

backup.. (Good practice if you have the space)

31. You can achieve this by using this command: 

boot system flash:c3750-ipbasek9-mz.122-52.SE.bin <enter>

32. type wr <enter>  and see that it is in the boot order successfully as shown below and reload.

33. Then reload and wait to see the boot-up with the new IOS

34.With a Show Version <enter> Command it show a successful IOS Change.

And you have still the previous IOS incase the new IOS has a bug.

Please leave comments and suggestions.