Force a custom EDID on external displays connected to Apple Silicon Macs (M1/M2/M3/M4).
Uses the private IOAVServiceSetVirtualEDIDMode API to dynamically override EDID at runtime — the only method that works on Apple Silicon (file-based plist overrides are ignored).
KVM switches often report fake/limited EDID to macOS, causing external displays to be stuck at 1080p even when they support 4K. This tool lets you apply the monitor's real EDID, unlocking the full resolution.