Ok, so I'm back from my dealership.
I've received an update... which was the version 283C37830R ![biggrin :D](https://www.talisman-forum.de/images/smilies/emojione/1f606.png)
So whatever it is said on M4 forums this update is still available on Renault servers despite its potential flaw(s).
It fixed few bugs for me (for example an annoying Espace bug that it always started with 2nd clima off, now it starts in auto).
If I understood the technician correctly I've also received an update for the BOSE amplifier.
I have to test it more to say if it fixed the BOSE bug for me, so far it seems so but maybe it didn't go into deep sleep yet, will report tomorrow or after the weekend.
Certainly it added wireless CarPlay which I'm grateful for, I can now remove my Cplay2Air adapter completely.
Liebe Grüße
Lukas