Hi @eric, having compared the 205 to a 203, the latter had no issues and simply showed up as a network device in Roon, and what I found out along the way, this is not a problem that can be solved.
Turns out I have purchased the 205 from a Bang & Olafsen dealer, and BO forced OPPO to create a special firmware for them that does not show the OPPO logo on the screensaver. These people never told me about the firmware, and it wouldn’t have made any difference since it literally was the last OPPO 205 that I could find and I would have bought it anyway.
I am also guessing that this special firmware somehow disables Roon Ready. So I am screwed.
So you can mark this topic as closed.