Hello. My name is Mabel and I'm from Argentina. My brother bought an electronic cash register (ER-430) a few days ago. The problem is that he inserted the manager key and pressed unintentionally one of the left keys (he doesn´t remember which one) and an error appeared on the display (E040004480; this is the error). He pressed the CL key, but it didn't work. What can he do? Thank you so much. Kind regards. Mabel Favaretto.