Cisco IOS upgradation 2960 Switch..!

 To upgrade the IOS you need to have a tftp server connected to your switch and there must be a layer-3 reachability between TFTP server and the Switch.

I am assuming you have configured the TFTP server properly and make sure, in your TFTP server The firewall and antivirus is disabled.

Step-1=Copy the IOS file from TFTP to your server.

Switch#copy tftp flash

Address or name of remote host []? 172.16.10.2

Source filename []? c2960-lanbasek9-tar.150-2.SE11-1.tar

Step-2=if its bin file you don't need to extract but if its tar file you need to extract it first.As i have a TAR file lets extract it first.

Switch#archive tar /xtract c2960-lanbasek9-tar.150-2.SE11-1.tar flash:/

Step-3=change the boot IOS .

Switch#boot system flash:/c2960-lanbasek9-mz.150-2.SE11/c2960-lanbasek9-mz.150-2.SE11.bin

Step-4=Reboot the IOS .

Switch#reload