Prerequisites

Create a Reloaded Mod

Follow the guidance in the Reloaded wiki to create a new Reloaded mod.

Download Mod

If you don't have it already, download the CRI FileSystem V2 Hook Mod from GitHub or Download Mods section.

Set Dependency on CRI FS V2 Hook

In the Edit Mod menu (right click your mod in mods list) we're going to add CRI FileSystem V2 Hook as a dependency.

Adding a 'dependency' to your mod will make it such that P5R Essentials will always be loaded when your mod is loaded. This is a necessary step.

Replacing files in CPKs

Files inside CPKs can be replaced by creating a folder called CRIFsV2Hook/CPK in your mod, and adding folders corresponding to the names of the CPKs inside those folders.

Opening the Mod Folder

Go to the folder where your mod is stored, this can be done by simply clicking the Open Folder button.

Add Some Files

Make a folder called CRIFsV2Hook, and inside that a folder called CPK.
Inside that folder, make a folder [or multiple!] where you will store your mod files (you can call it anything you want!).

I used EN.CPK for clarity to match the game's structure.

We will replace these two files to enable different button prompts 😇.

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The contents of our mod folder would now look as follows.

// Mod Contents
ModConfig.json
Preview.png
CRIFsV2Hook
└─CPK
  └─EN.CPK
    └─BUTTON
      ├─BUTTON_XBOX.PAK
      └─BUTTONXBOXTEXINFO.DAT

The connectors └─ represent folders.

Releasing/Uploading your Mods

Please refer to the Reloaded wiki, and follow the guidance.

You should both Enable Update Support AND Publish according to the guidelines.

It is recommended to enable update support even if you don't plan to ship updates as doing so will allow your mod to be used in Mod Packs.