Garmin StreetPilot 2620 GPS Receiver "unlock maps approach" Questions

...unlock code for the unit you purchased (If the previouse owner purchased the software you wanted! Go ahead and RELOAD the ORIGINAL maps to your Garmin. Get it into the Position You Know It Is "KNOWN ...

unlock maps as soon as you turn it on. Suggestions? There's information on how to unlock maps on Garmin nuvi satnavs at http://www.fixya.com/support/r6197735-no_detailed_maps_found_support_routing