What is one-key-hidpi?

This is a small shell script that enables HiDPI display mode on macOS for monitors that do not natively support it. HiDPI makes text and interface elements appear sharper by rendering at a higher resolution and then scaling down. On Apple's Retina displays this happens automatically, but most external monitors do not qualify. The script fakes the required display metadata to unlock the HiDPI option in System Preferences, giving users a "Native" scaled setting that would otherwise be hidden. Running it requires either pasting a single command into the Mac Terminal to fetch and execute the script directly from the internet, or downloading the ZIP file, extracting it, and double-clicking the included command file. During setup the script presents a few options, including a second choice that patches the display's EDID data, which can help if your monitor has trouble waking from sleep after HiDPI is enabled. If something goes wrong and your Mac cannot boot normally after running the script, there is a recovery path. You can restart into macOS Recovery mode, open Terminal from there, navigate to your user folder, and run a hidden disable script that was placed there during setup. Alternatively, you can manually delete the display override folder the script created under the system Library directory. The README is brief and mostly covers the two run modes and the recovery steps. It does not document which macOS versions are supported, which display resolutions work best, or what side effects to expect beyond a note that scaled logos may look blurry because the higher resolution is simulated rather than native.