To install the English version as a on a modified 3DS, you generally have two main paths: Option 1: Manual Patching (Recommended for Legality)
Open the SD card directory and navigate to a folder named cias . If this folder does not exist at the root of your SD card, create it.
Press the button. The system will "rebuild the home menu database." A new icon should appear: Taiga (the protagonist) and his partner Koromon. The title should be in English.
For over a decade, Western Digimon fans have lived with a particular brand of heartbreak. While Japan enjoyed a steady stream of deep, creature-collecting RPGs, the international market was often left with watered-down ports or nothing at all. The biggest victim of this regional lockout? for the Nintendo 3DS.
You will see a "Present" on your home screen. Open it to install the game icon.
Once you have your English Patched CIA file, you need to place it somewhere your 3DS can access it.
Warning: Installing game files or modifications to run unofficial translations or copies may violate copyright and the terms of service of your device. This guide is for informational purposes only. Do not proceed unless you own a legal copy of the game and understand local laws.