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This method does work for configuring open system WiFi networks with no password.
After doing all the steps below the printer doesn't connect to WiFi, try “updating” to UI/LCD firmware version 34. After flashing version 34, the display will show that it is version 33. They forgot to increment the version number. Going back to version 34 helped with my printer received 2016-05-27 but one received 2016-09-02 didn't matter. On my printer received 2016-05-27, UI firmware version 34 is the only version that the smart config dialog stay up after releasing the button.