More info here, and 2 reviews.
https://www.ecstuning.com/b-bremmen-parts/bremmen-e53-e39-multi-media-unit-w-buttons/u96530~brp/

 

link didnt show any reviews available when clicked on. unit looks suspiciously e o n o n ish

 

It could be the eon on unit.
Here is one of them, maybe it’s their latest model, it looks a little bit different than the Bremmen unit. $100 less and has more memory too.
BMW 5 Series E39 Android 10 Car Stereo & Head Unit Q49PRO | Eonon.com

 

The ECS link had 2 reviews.

 

One good, one bad.

 

I mounted a tablet instead of headunit and am never looking back.
That's with aftermarket audio system.
Streaming directly to my amplifier from the tablet.

The quality is no lower than running rca cables.
The downside of course is that steering wheel controls don't work, but that's OK for me.

 

Ya gotta admit, the ECS installation document is first-rate!