This video will show you how to upgrade IOS on Cisco Switch. For this video, I am using Cisco Catalyst 2950 but same method can be applied to Catalyst 2960, 3550, 3650, 3750 as well as chassis switch. Telnet Client... http://www.putty.org/ TFTP Server... http://www.solarwinds.com/products/freetools/free_tftp_server.aspx Cisco IOS... https://software.cisco.com/download/navigator.html?mdfid=272995357 https://software.cisco.com/download/release.html?mdfid=277523496&flowid=2401&softwareid=280805680&release=12.1.22-EA14&relind=AVAILABLE&rellifecycle=ED&reltype=latest