The editor went back to the theatrical trailer (which had a different, more natural color grade) and the 1080p Blu-ray from 2014. He manually reconstructed the midtones.
The "Fixed" version is not an official studio product. It is the work of a fan editor known only as "Delta_City_87" (a nod to the original film’s setting). Using the Sony 4K master as a source, he applied a suite of proprietary and manual fixes. robocop 2014 4k fixed
Here is the changelog that has the community buzzing: The editor went back to the theatrical trailer
The 2021 4K disc used aggressive DNR, making Samuel L. Jackson’s face look like a CGI mannequin during his "Novak Element" news segments. Delta_City_87 layered a fine, 35mm-equivalent grain plate over the entire 4K image. robocop 2014 4k fixed