I have 2 x 3750 stack together and the ios version of them is 12.2(25)SE. I am going to upgrade the IOS. I have upload the IOS to the switch's flash, but I don't know how to make the 3750 load the new IOS after reload. I have checked the link http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_example09186a00804799d7.shtml#mupgrade
but the command "load system switch all <path>" seems not included in my 3750 existing IOS. Please help!!!