Are you sure your cable is fine? and your battery is fully charged before modding? since sometimes, if you're running out of battery in the middle of modding, it will not be able to success at all.
And about the cable, make sure it still fine, i mean sometimes, when you connect it, it really connect, but when you bend it or move it a little, it just turned disconnected.
make sure you install the correct driver, take the driver from motodev, or from the Rokr Elysion Monster Pact.
It's quite new thing that it happens, but well, just retry it, when it still failed, ask here again,
