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[FE3H] ROM Hacking Guide

Overview

FE3H hacking is currently in it's infancy/investigation phases. As a result, a lot of information and files are not documented, and tools haven't been made. If something isn't mentioned here, it's likely that information on it does not exist. Join the server!

IMPORTANT NOTE

• If you are looking to mod gamedata (i.e. Characters, Classes, Items), dump the romfs of the update instead. Most gamedata in the base game's romfs is outdated due to being updated in the update.

Getting Started

Custom Firmware (CFW) is needed for file redirection of the romFS and exeFS, which enables ROM editing.

• To install CFW on your switch, follow this guide.

Dump and Extract Game.

Creating Mods

What Can Be Currently Modded?

• Models
• Textures
• KTSL2ASBIN files (Audio)
• Text
• Some Gamedata (i.e. Characters, Classes, Items)

Patching Game

Methods

• Starfall
  • A file redirection layer for Fire Emblem Three Houses (only use if Aldebaran doesn't work)
• Aldebaran
  • A file redirection layer and real-time ID logging for Fire Emblem Three Houses
• Script & Tool Patching
  • Using the game's own patching method by creating the patch files automatically
• Hex Patching
  • Using the game's own patching method by creating the patch files manually