While "RDR" files are often associated with tools like for quick restoration of a bootable installer, this specific method is now considered outdated and potentially risky . Solid Review of the "Clover Rdr" Method Guide on Creating Clover Bootloader USB on macOS

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If you're running macOS High Sierra 10.13.5 and have a Realtek Ethernet card, you might experience network issues or poor performance. Clover RDR can help resolve these issues by providing a more compatible and efficient driver.