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Copy the three files from the Garmin folder on the SD card to the Garmin folder on the Nuvi.You’ll get the message that there’s no enough space. You have to delete them first because for some reason, you can’t just overwrite them. Delete the gmapprom.img, gmaporom.unl and gmapprom.gma files from the Garmin folder on the Nuvi.It will now be recognized as the Garmin device. Delete the garmindevice.xml file from the Garmin folder on the SD drive so the SD drive will no longer be recognized as the Garmin device.They will be named gmapprom.img, gmaporom.unl and gmapprom.gma.
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After the download is complete, you will have 3 maps files in the Garmin folder of the SD card.The SD card will now be recognized as the Garmin device. Copy the file named garmindevice.xml from the Garmin folder on the Nuvi to the Garmin folder on the SD drive.
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Then remain stationary for several minutes. If you are having trouble obtaining a satellite signal, make sure your Nvi is out of parking garages and away from tall buildings and tress.