Use a tool like xdelta UI or DeltaPatcher .
The is a fan-made translation project, primarily hosted and discussed on forums like GBAtemp , Romhacking.net , and Reddit’s r/Gundam. This is not an official release, but a labor of love by volunteers who spent hundreds of hours reverse-engineering the PS2’s file structure, translating over 100,000 Japanese characters, and hacking the game’s executable to display English text. Use a tool like xdelta UI or DeltaPatcher