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Upgrade an IOS on a Cisco Router

Before Starting procedure you need to download and install a TFTP server on your PC
There are many Free TFTP server just download one and install your PC.

Step 1
Create a consol connection with the default setting

Step 2

To your TFTP server put the IOS file which IOS you want to install of your router.

Step 3
Run the Following Command
Router#copy tftp flash
Address or name of remote host []? 192.168.111.3  [This IP is your TFTP Server IP]
Source filename []? c1700-sy7-mz.123-15.bin       [This file name is your IOS file name]
Destination filename [c1700-sy7-mz.123-15.bin]?   [Hit Enter or if you want change file name then type new file name]

Erase flash: before copying? [confirm]    [hit Enter]


Then it erase your existing IOS and it will install your new IOS.

Route#show run | include boot

boot system flash:c2600-adventerprisek9-mz.123-21.bin
 
Route#configure terminal
Route(config)#no boot system
Route(config)#boot system flash:c2600-adventerprisek9-mz.124-12.bin   [Remove OLD IOS]
Route(config)#boot system  slot1:c1700-sy7-mz.123-15.bin   [BOOT from New IOS]
Route(config)#exit
Router#wr
Router#reload
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