Blackmagic UltraStudio 4K - LG OLED & black levels

I have an UltraStudio 4K. When I run Flame 2025.1.1 into my LG OLED through the HDMI, the blacks aren’t black. It works fine with Premiere and Resolve. Is there a setup I am missing?

you have to choose RGB 12bit in Flame Prefs.

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Yep. Figured it something that easy. Thank you.