[Steve at Sounds Heavenly]

Hi Anastasios,

Yes, there seem to be a lot of variants of USB-C to analogue audio adapters, if you have a UK shipping address then I can provide this adapter which does work correctly with the Theatre:-

https://soundsheavenly.com/tv-input/191-usb-c-audio-input-adapter-for-beosound-theatre-ref-6271374.html

Kind regards, Steve.