Every PS3 game has a specific code (e.g., BLUS30109, BLES00225). An EBOOT from a US version of a game will rarely work on a European copy.
Some modded EBOOTs are hardcoded for specific firmware versions (like 4.84 or 4.90). Ensure your CFW or HEN matches the requirement.
Avoid random file-sharing sites that require you to click through endless pop-ups or download executable .exe installers. Stick to established console modding communities:
Look for dedicated preservation threads on forums like PSX-Place.
If your game fails to launch or black-screens after replacing the file, check the following: