Try to simply pull the stick in the other direction than what you are supposed to. That should reverse it.
I get the logic behind it, but it doesnt matter what I do, I cant get all to be in the correct direction. I have calibrated the same way several times in a row, and each time get a different result. Like it doesnt make sense. example: left stick says up, I push up; right stick says up, I push up. Then afterwards one stick goes up, and the other goes down. Then another calibration cycle they both go up, or sometimes they go down. It's real odd and I dont think it's user error. Should I re install?