I am using my same tool https://gbatemp.net/threads/gbaatm-rebirth-gba-auto-trainer-maker-a-new-hope.564321/ to patch the GBA rom.
The point is that after you pick the language the savegame is changed also if it is on boot, so there are no new stuff to save. This create issue with the cheat trainer because start before the game, values changed and the savegame is different. The problem happening it is that is moving back the story to the previous finished castle/campaign/call as...
Disable save game on Kingdom Hearts on boot
The point is that after you pick the language the savegame is changed also if it is on boot, so there are no new stuff to save. This create issue with the cheat trainer because start before the game, values changed and the savegame is different. The problem happening it is that is moving back the story to the previous finished castle/campaign/call as...
Disable save game on Kingdom Hearts on boot