Asd this site is the hive of information.

I have been given a kenwood kdc-5080r stereo and its had a code put in and we dont know it so its unuseable. Would anyone happen to know how to reset it??

i had the same problem with a sony cd player. i used google to search and found a forum where a guy had supplied most of the codes. so just typed them in until got the right one.

hope this helps

Rob