Hi,
I recently purchased a Pronto Neo second hand, and experienced the same problem with a Philips brand DVR. None of the supplied codes worked, but the remote learned all of the critical functions with no problem, except for the DVR. With the DVR, a few of the buttons would program, but not others. But, after several tries, most were eventually accepted. I'm not sure why this happened, and only with this one unit, but most of the buttons worked after 5 to 10 repeated tries. One button took at least 30 repititions to work. I know it sounds aggrivating, but try doing the same button 10 or 15 times. If you can get one button to learn, you can probably get all of them to learn.