UnLock Map or Mapsource
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1. Put your DeviceID ( In Garmin Tools/Settings/About or some similar)
2. Select <custom mapset>
3. Put MapID
4. Generate

5a. Unlock map image - Make .UNL file with this 25 digits generated key ( If map is GMAPSUPP.IMG make GMAPSUPP.UNL file...) (save as .UNL not .UNL.TXT)
or
5b. Unlock Mapsource map - Unlock map in Mapsource go menu "Utilities\manage map products\Unlock regions" push add button and add key here

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UnLock Garmin Mobile XT/PC
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1. Put your DeviceID ( In Garmin Tools/Settings/About or some similar)
2. Select Product Garmin Mobile XT/PC
3. Generate
4. Make SW.UNL file with this 25 digits generated key (save as .UNL not .UNL.TXT) Copy that SW.UNL file to Garmin directory