Could you please elaborate on how to find the folder location of the game? I'm finding multiple config files and I really only have one DS VC game installed at the moment! Thanks!
Basically, use the title key as a "map" to navigate the file system. You can find this number by looking at the folder name of the WUP format game you downloaded from Wii U Helper.
For example, this [00050000101C3700] is the title key for Phantom Hourglass.
So starting on the top level folder, go to "storage_usb" (please tell me you have your games on an external, cuz I don't know how to do this looking at nand storage! Not to mention its risky!).
From there, go to "usr" then next "title". Then, use the first 8 digits of the title key to find the right folder.
Since mine was 00050000101C3700, that folder for me was "00050000"
Next, use the remaining numbers in the title key to locate he next folder.
Again, since mine was 00050000101C3700, that (next) folder for me was "101C3700"
From there, go to "content", then open the next folder (called "0010" for me, hope its always one folder here).
Then BAM, there it is, the configuration file you want called "configuration_cafe.json" (and the rom itself in the zip folder).
Now here's MY question, does this "renderscale" edit actually work for Spirit Tracks and Phantom Hourglass? Because when I do the edit process, the result is that the image is stretched out to fill the screen, BUT the resolution remains low (so it looks worse actually).
If there is a way to get this to work I'd love to know, otherwise I'll just play at original resolution and aspect ratio