I used that to install the dual recovery on my phone using the chillychan's post...
Download the kernel-136-dual
from his post
Download the SuperSu
Put the SuperSU in the phone SDCard for example...
Shutdown your device.
Plug the usb and press in the same time Volume Key Up
Click on the first icon is like a thunder... and select fastboot mode then click on "Select kernel to flash" and get the "kernel-136-dual.img"
And the flashtool install the kernel..
You see in the dialog box..
Unplug the usb cable and turn on you device and press the Volume key Down or Up
My case the Volume Down opens TWRP and then go to "install" and find the SuperSu that you put on the phone.. Install that and reboot
Nothing more to do...