The cheats are saved. And can't be turned off, AFAIK. First you must reboot. (Turn off the Xbox and turn it back on, or open and close the CD tray.) Then go to the "select level" menu, from the 'extras' menu. The last level you finished should be listed there, and maybe the next level. If the next level(Yavin Temple) isn't there, you can use the cheat for all levels(DINGO) or the one for the first seven(CHERRY.) Select a level and after it loads save. Exit the game and turn your cheat back on, and then save again if you don't want to enter the cheat every time.