I quite agree, Onyx readers are outstanding as far as hardware is concerned, but they don't simply work, you need to discover their capabilities on your own. That's why a good manual would be very useful.
About the i62HD, there's this manual which comes close:
However, it's referring to a slightly different model, it's outdated since the firmware has changed significantly, and the author's English is pathetic. But it might be a starting point.