Shin Megami Tensei IV – “Undub” – 3DS – Decrypted ROM: An Overview
Published: 2026
Solution: Most UNDUB ROMs do not include DLC. You need to source the DLC .cia files separately (the Japanese DLC works fine with the UNDUB patch). Install them after the main game.
For the veteran Samurai looking to reconquer the Eastern Kingdom of Mikado, or the newcomer brave enough to face the series' brutal difficulty, the SMT IV Undub is the definitive experience. Shin Megami Tensei IV -UNDUB- 3DS -Decrypted- ROM
It turns a silent, text-heavy adventure into a cinematic journey. It proves that in a game about summoning gods and demons, the voice is just as important as the sword.
Disclaimer: This article is for educational and preservation purposes. The creation and distribution of ROMs exists in a legal gray area regarding abandonware and software preservation. Support the official developers whenever possible.
It is important to note that the Undub retains the English text. You are playing the game with English menus, item descriptions, and dialogue scripts. The magic lies in the dissonance: reading the carefully localized English script while hearing the original Japanese voice actors deliver the lines. Shin Megami Tensei IV – “Undub” – 3DS
Purists argue this is the best of both worlds. You get the accuracy of the original vocal performances—intended by the developers to match the character models and setting—without the need for a dictionary.
Citra, the open-source 3DS emulator, received a "Vulkan" backend update that dramatically improves performance for SMT IV.
File > Load File and select your decrypted .3ds UNDUB ROM.Original Release – Shin Megami Tensei IV (SMT IV) launched for the Nintendo 3DS in 2013 (Japan) and 2014 (North America/Europe). The game’s official version contains a Japanese‑language voice track and a Western‑language text translation (the “dub” in the title refers to the English voice‑over that was never actually included on the cartridge; the term “undub” has become a community shorthand for the English‑only version that removes the unused Japanese voice data). Error: "Missing DLC" Solution: Most UNDUB ROMs do
Undub Project – The “undub” community effort strips the Japanese voice assets from the ROM and rebuilds the game so that only the English text and UI remain. The result is a cleaner, slightly smaller ROM that runs faster on emulators and home‑brew 3DS hardware because the unnecessary audio data is gone.
Decrypted ROM – Nintendo’s 3DS cartridges ship with data encrypted using the console’s hardware keys. A decrypted ROM is a dump of the cartridge in which that encryption layer has been removed, leaving raw program code, assets, and resources that can be inspected, modified, or re‑packed. In the case of the SMT IV undub, the decrypted ROM is the starting point for the removal of the Japanese voice files and the insertion of the English‑only assets.