Does anyone know if there is a default security code when you remove the battery from the Kenwood kvt-910? I bought a used system and it is asking for the code when I start it up... Ive tried 1234, 1111, 0000, and 9999 and they dont work. I have emailed the seller but he hasnt gotten back to me yet. I know the unit is legit since I have the invoice from Car Toys and its written to the seller. Do you know if I tried resetting the unit, if that would work? Any help would be appreciated since Kenwood takes a month to reply to anything on their website.