In your nuvi: Go to Settings -> System -> About. Get your unit ID there.
Post an unlock key request for that UnitID and MapID 284 here:
viewtopic.php?f=38&t=35367Now you have two options here:
Option 1 - saving mapset on a storage media (SD Card)
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1. Once you get your unlock code, save it into a file called GMAPSUPP.UNL (using Notepad let's say)
2. Rename your downloaded GMAPPROM.IMG to GMAPSUPP.IMG.
3. Create a directory called Garmin on your storage media root directory
4. Put both GMAPSUPP.IMG and GMAPSUPP.UNL to \Garmin directory.
5. Insert your storage media into the nuvi and there you go!
Option 2 - overwriting existing preloaded mapset within the nuvi
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1. Once you get your unlock code, save it into a file called GMAPPROM.UNL (using Notepad let's say)
1. Connect your nuvi to the PC and go to Garmin directory.
2. Make a backup copy of your current GMAPPROM.IMG mapset file.
3. Delete GMAPPROM.IMG mapset file from nuvi.
4. Upload the new GMAPPROM.IMG mapset to your nuvi (same directory) along with GMAPPROM.UNL and there you go!