Loading Mods in Persona 5
What's a Mod.cpk?A mod.cpk file is a prepackaged archive that the game can load mods from. The files inside override the contents loaded from the game's other CPK files.
In order for this to work, you need to either replace the game's EBOOT or patch it with this YML file made by TGE.
Download the EBOOT for your region and CFW type. If there isn't one for your region, see this guide on patching the EBOOT yourself.
Or, if you're using an emulator,
download the patch.yml for RPCS3 to get started.