A:
Cables do matter. If the cables are 2.0 a, 2.0 b high speed 4K or Ultra 4K. I tired new cables from the cable company with my LG 875 Ultra blu Ray player and they do not work. I bought some new Ultra 4K (2.0 b) cables and now it works at 2160p. When I used the other cables I would get screen flashing and lines across the screen. When I changed the display to 1080p it was fine, hence the cable company wires were not up to par with the new high speed 2.0 b standard. You’ll be good with 2.0 b until the 8 or 10k jump then you’ll need the 2.1 and all the corresponding equipment lol.