Don't expect a manual or anything like that; they don't care, as you can see from what they answer.
That's why I now value devices with codes more, and more people like me will have seen the situation and the arrogance of not wanting to do it, since with the time this electronics has been on the market, they have had enough time to do it. But as I said, they don't care.
I hope the brands take note of this and people stop buying from them; you'll see that then they will actually do it.