I am reading this lengthy thread, which seems to be addressing the same issue, albeit with the original KEF LS50 speakers, not the LS50 II.
One thing that jumps out at me from my first perusal is the suggestion to attached the computer holding the core to either the wifi router or the speakers, via ethernet. I could do this - I think I can connect to the router very easily, but not sure how to connect to the speakers (the master speaker?).
I am 70 yrs. old and waaaayyyyy less technical than the people who are active on this board, so I’m struggling a bit! Thank you.