sedde

Hi guys, newcomer here. I bought a 65c8 oled tv, and i have severe sound sync problems with my lg home cinema via bluetooth, and not so severe via arc. my tv came with 3.05 if i recall, and it was updated to 4.10.05, and yesterday it did 4.10.15. Sound sync problems still persist, and my autoupdate shows no updates, any firmwares recommended to fix my issues? Thanks in advance