Hey everyone, I have a Street Pilot c330 and was having a terrible time trying to get Europe NT 2008 (Map ID 284) to run on a 2GB SD card. You need a 2GB card cause Europe NT 2008 is 1.4 GB in size.The Unit ID which you access through "system/about" on the touch screen of the GPS unit is worthless if you're trying to get the GPS unit to read the map on an SD card.
It turns out you need the SD Internal Serial Number in order to unlock the maps!! The serial number printed on the outside, if you find it, is worthless. If you look for how to get the SD's Internal Serial online, it is daunting,
you need some high powered custom software to hack this out of the card. However, Garmin has made it easy for us
Just put the SD card into the c330, acknowledge that it doesn't work...(YET!), then press and hold the top right of the screen for maybe 10 seconds to access the "Service Menus", scroll over to the menu "Data Card Test Page" it contains the SD card info on it and the SD Serial is printed right there. It is a 10 digit number. This SD ID is the number you need to post here as the "Unit ID" along with your Map ID. I couldn't figure out how to leave the "Service Mode" on my c330 so I did a "Gross Reset" by shutting it off, when it restarts it's back to it's normal simple self. Another way to get to the service mode on some units is by pressing and holding the power on button and the unit will start in service mode.
Now, I put the "Device Code" into an SW.unl file and the "Map Code" into a GMAPSUPP.unl file. I have these files in a Garmin directory on my SD card along with the GMAPSUPP.img file, when I put this SD card into my Street Pilot c330, it Fookin Works Great!!!! I don't know if it needed the Device Code in the SW.unl file or not, I got it to work with the SW file in there and I ain't gonna experiment now by removing it just to see what happens.
I have Done it! Not guessing anymore
! I can see street level details in Berlin and Chicago both. Life is Good!
Can't guarantee this will work with anything else, but if you're having trouble trying to get this to work otherwise, it's worth a shot!All you guy's out there giving out codes, try to refer users to this post if they can't seem to get their units to work.
Peace and Good Luck to all you hacks out there!