Sorry - these are really old ‘news’.
The app platform on the Avant 1st gen has been unusable for years now - some still use the Youtube app, though.
Everyone I know will tell you to get an AppleTV (and load the ATV PUC to control it with the beoremote) and use that or to use the Chromecast dongle for streaming from an external device.
As for the DRM function (I am sure you mean the ability to show/play what is send via DLNA to the Avant)……that is also long gone.
That feature was taken out with a software update, that brought the netradio function (which previously was not there).
I remember having a chat with the support at that time.
They offered me a rollback to the previous sw…..which then would not have the netradio function.
So I prefered the netradio!
You can still use DLNA via the Avant - you can connect it to a DLNA server of your choice and search via the Home Media section on the tv.
That works well - although the search function (depending on the functions of the DLNA server used) can be a bit cumbersome.
If I were to use Deezer, I would use a network linked B&O product (if you don’t have any, the cheapest option would be an M3) and simply connect that to the Avant….and use the built in Deezer app there via the B&O app (expand to or join).
By the way - for those who use Spotify Premium - the Avant acts as a Connect device for that, if connected to another NL capable B&O device.
The ‘B&O contacted’ guys should know that or at least have been able to provide you with the knowlege from HQ.
MM