Just rename the Japanese Save file to the exact name of the US rom For example Ragnarok DS(U).nds Ragnarok DS(U).sav
Well you will have to delete it from the MicroSD Or just rename it to something random and keep it on your MicroSD You can also keep that file on your Computer
dude, It says the save/bookmark file is corrupted, (I remember my file was a english patched does that do anything) and I downloaded the US version from europe so whats the problem?
What emulator/flashcard are you using Also is the Japanese Save file renamed to what the English rom is called