@Slurpies
Here's one of the earlier full builds, compiled for 6d.
https://drive.google.com/open?id=1N1MnP276bHw24dG6MTu8oIaGWb0Vogg1Never experienced any troubles with it, but to be sure nothing bad happens, it's best to not press any buttons or ML menu stuff etc, while this module is setting up (as long as the red led is blinking

).
It works as follows.
The module must be put in the Magic lantern module folder on your SD card.
Now when starting your camera up, you can activate this module in the module tab.
After a new camera startup the module is loaded, but not activated by default.
Activation is done in the Debug tab from the ML menu, there is a new option there called SD Overclock, highlight this option and press the set button.
If all is right, you see text appearing on the screen doing some writing and reading tests on your card, you'll see the red led blinking, as long as the blinking goes on, it's best to do nothing and just wait.
At the end, it shows the best setting and has set this setting, you can close console(those box with text) in the debug menu with option show console, turn it on and off.
As long as you don't turn off the camera, the SD overclock settings are set.
Once you turn off the camera, SD overclock setting is gone, you have to run this module every time you want to use it.
If the last setting the module tests during setup, is the fastest for your card, I have another altered version of SD-UHS module, which is a little quicker and user friendly, it just setups the SD interface to highest setting.