Goli discovered that when you unpack the Golden Sun Dark Dawn rom w/ DSbuff, that there seem to be several files that indicate multiple languages being somewhere in the ROM. Armed with this information, I tried changing the header from BO5J to BO5E. This changed the main logo to what I presume is the US version, but none of the other language-specific elements load properly. I'm thinking there might be more changes needed for them to load? It doesn't seem like the Japanese files are any larger than the English files, so I would think they are complete. I'm hoping someone with hacking skills that I don't have could take a look and maybe figure it out vs Update: NahuelDS made some solid progress!