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I looked at the document you pointed and with a fresh install of the latest image I tried to reset a sketch and just as you mentioned, the button doesn’t work as expected. My guess is that is caused by the sketch persistent feature. In newer images, the sketch persistent feature is not enabled, so when the button is pressed, the board is not programmed to reload the sketch.
There’s more than one method to enable the sketch persistent feature. I tried two different methods and the one that worked is the one described in this thread https://communities.intel.com/thread/77945 for this specific scenario. Once I followed this thread and enabled the sketch persistent feature the button began to work. I checked the sketch was enabled after the sketch reset with the command ps.
Follow the method we recommended and let us know your results.