ask the maker, only they have a cure. (their design !)
you posted with no maker of safe told nor model.
impossible question.
btw some have hidden key, but you lost that too..
there should be an access code maybe on the back of the device, if you have mounted it, remove it and inspect the back of it for code also check for code anywhere inside the the advertisement from package. if you bought it from a neighbor and it was opened, give it back,,,nice try
