If you are looking for a "decrypted" version of the ROM, it is likely because you are using the Citra emulator or a similar PC-based environment.
Shin Megami Tensei IV stands as a pillar of the 3DS RPG library, known for its dark atmosphere, challenging press-turn combat, and philosophical depth. However, many western fans prefer the original Japanese voice acting over the English dub to maintain the game's intended tone. This has led to a high demand for the "Undub" version—a fan-modified edition that restores the Japanese audio while keeping the English text. Understanding the SMT IV Undub shin megami tensei iv undub 3ds decrypted rom free
Your (Original 3DS hardware or Citra emulator) If you need help finding the specific patching tools If you are looking for performance optimization settings If you are looking for a "decrypted" version