Community members on forums like GBAtemp have historically worked on translation projects to bring English text to the Japanese ISO. These typically involve patching an original Japanese .iso file with a .xdelta or .ppf patch.
An expansion titled Dynasty Warriors 6: Special was released in English, but the specific Empires expansion remained on the newer consoles and the PSP. Game Features (Japanese PSP Version) If you choose to play the Japanese ISO, the game features: Dynasty Warriors 6 Empires Psp Iso English LINK
