⚠️ At your own risk. Editing an EDID can leave you with a black or green screen. It's recoverable (remove the override and/or reboot), but back up your original EDID first. No warranty, you break it you keep both pieces, etc.
LG UltraGear 4K monitors that reach 240 Hz over DisplayPort 1.4 with DSC advertise these 4K refresh rates in their DisplayID block:
3840x2160 @ 240 Hz