Once you enabled the module, there’s a new option in the ‘Debug’ menu in ML.
Best to click this option in photo mode, without liveview.
If you click this SD-uhs hack option, the red cardreader led blinks a few times, wait with button pressing and stuff until the cardreader led stops blinking.
When it’s stops blinking it’s ready for use.
Once the camera is set to off, the sd-uhs hack is disabled, needs to be repeated every time you turn on the camera.