SamyGO

I was messing around in the Service Menu to see if I could get PC Mode to have a backlight flicker of 960hz like VRR does, and didn't really find anything. I enabled Flickerless but that did not stop the ghosting in PC Mode. I turned on HDID by accident but turned it off again. I changed PWM Mid to 50 from 5 to see if that would minimize the dimming, and everything got way too whitewashed so I turned it back to 5. Pretty sure this is all I did.

Unfortunately now the black level of all my HDMI inputs is way too high. The deep blacks are gone but changing Shadow Detail helps a little bit. It does not seem to be the backlight since that still dims. The internal TV apps seem fine. Any ideas? Some kind of HDMI setting I can try?

I am on regular firmware 1903. Is there a way to force it to reinstall? Will the next firmware update possibly fix it?

Thanks in advance for any advice! I will definitely donate if you can help.

Here on forum you can find an comment from one user that you can reset service menu to it's default changing panel type or something similar I can't remember now. (BEFORE YOU CUT MEASURE TWICE OR READ TWICE )
Also you can try find some videos on YouTube and maybe you are lucky and someone shoot the menu which you are interested in
https://youtu.be/J94NCswEEXw