ok first of all when you upgrade high class items you want to get the BUS's from dupers, then you have to get the weapons/armor from scamming and a trina from premium. after that you put the weapon/armor in the anvil and bus on slot 2 and trina in slot 4 then wait for the anvil to turn red, but that's not all: you have to have your left pinkie toughing your forehead while you have your right foot on top of your monitor, then you have to hop on your left leg and touch your chin with your left thumb. then you click the confirm button.
congratulations you just made a +2 item! i have never failed while doing this and i guarantee it will work for you! ^^