Much of the patch utilized half-finished translation files discovered within the original game's data, which were later refined by the community to ensure ease of installation.
If you search for "earth defense force 2 psp english patch" and expect a simple drag-and-drop, you might be disappointed. The process requires basic ROM patching skills. However, the reward is one of the finest twin-stick shooters (using the face buttons for camera) ever created. earth defense force 2 psp english patch hot
: These often remain in Japanese as they weren't fully included in the hidden game files Gameplay Reference (English) Much of the patch utilized half-finished translation files
If you prefer a fully official English experience, there are better options than the PSP version: earth defense force 2 psp english patch hot