However I can say to answer my own question earlier, after having installed the update via USB, the local dimming variations have been somewhat addressed. Before some movies with mixed contrast scenes would make the TV alternate between extremely dim and bright in an obvious and annoying way, especially with subtitles on. Now the variations are less pronounced, but still present. I guess I can live with it, esp. since there isn't another TV this year as big, detailed and future proof at the same price point, especially after the recent discounts.
Just wondering if your in movie mode? On my tv, it would do this annoying fluctuation like you describe. All I did was go to standard mode, and it never came back at all. Of course for all I know, my now old tv just had a weird quirk to it. But it might be worth trying anyway.....
amazing prices through armed forces aafes on these 8k sets, so Im really interested in all the feedback on this set
Samsung K8500 4k Blu-Ray Player
Sony STR ZA1100ES Atmos/DTSx 5.1.2
Xbox One S/Xbox One X/Ps4 Pro/Apple TV 4K 64GB