This is the best summary I could come up with:

Thursday’s stable release of SteamOS version 3.5.5 offers a suite of free, system-level updates to improve and tweak the display performance on the original Steam Deck.

That “Boosted” setting might not be worth it in every situation since Valve warns it “may result in gradient clipping” (which you can see some signs of in the photos above).

Still, that might be a small price to pay for oranges and reds that pop way more than they used to on the Steam Deck’s LCD (though still well below what you’d see on a native HDR display).

Software alone can’t raise the Steam Deck LCD’s visuals to the level of the newer OLED display, of course, or improve the relative contrast and brightness limitations inherent in the older screen.

Still, it’s nice to see that Valve isn’t instantly abandoning original Steam Deck owners and is doing what it can to improve their visual experience through software.

Elsewhere in the update notes, Valve points out that the Steam Deck LCD can now output full HDR and variable refresh rate content to an external monitor, even though those features aren’t supported on the portable screen itself.

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