There is no legitimate way to play Cuphead on an Xbox 360. If you have an RGH console, obtaining Cuphead for it would require illegal downloading of a non-existent official port.
Despite what various search results and videos might suggest, Cuphead was never officially released for the Go to product viewer dialog for this item. descargar juego cuphead para xbox 360 rgh hot
— it launched for Xbox One, PC, Nintendo Switch, PS4, and later Tesla cars, but not for the Xbox 360. Any "Cuphead for Xbox 360" files you find online are likely fake, homebrew clones, or malware. There is no legitimate way to play Cuphead on an Xbox 360