KOBOereader is the name where your e-reader is mounted on your PC (this may vary if you're on Windows, Mac, Linux, .....)
In there you'll have an hidden folder .adds (on mac you'll not see this unless you activated to see hidden files). In that folder, you'll need a folder nm and in that folder the "config" file.
Being at work, I don't have my reader with me, but you should be able to find everything you need in this thread.
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