Since you bought the device used, it's likely the previous owner did not clear the passwords and data. Short of tracking down the previous owner, there is no way to unlock the unit without doing a factory reset. Here's a guide to reset the Garmin GPS units to their original factory settings.
http://www.mydigitallife.info/2009/06/09/how-to-reset-garmin-nuvi-gps-device-access-maintenance-mode/
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