The safest and most reliable way to play with Japanese voices is to use a "LayeredFS" patch on a modded 3DS. This method modifies the game's files on the fly without needing a pre-patched, potentially unsafe ROM.
If you are looking for a "decrypted ROM," you are likely using an emulator like . To get the Undub working, there are generally two ways players handle it: shin megami tensei iv undub 3ds decrypted rom free
Searching for a " Shin Megami Tensei IV undub decrypted ROM" typically refers to finding a pre-patched version of the game that uses the original Japanese voice acting with English text. While downloading copyrighted ROMs from the internet is generally considered , you can legally create your own "undub" version if you own the original physical game. How to Create an SMT IV Undub (Legal Method) The safest and most reliable way to play