Well, just tried to put this last firmware on my devialet 250 pro and the screen froze on "UPGRADING DOS" (it has been more than half a hour), not sure what I should do now in this case.....
Roon/Devialet Air/HTPC USB => Devialet 1000 Pro Core Infinity => Nordost Frey 2/strap Norse 2 => BW 802 D3