Ecortes88

just purchased a used unit, not knowing how complicated this is.... well, the screen is locked, only displais the "enter code" meno, but cannot select any numbers/keys. only function is the eject button. basically i think it is completely locked up. i tryed saving the file on this post on an sd card, but im not getting any response once inserted into the head unit. any advise or am i doing something wrong? used unit with a 42hr warranty to test. perfect looking condition, but cannot use....