The GPSMAP 420S will only work with g2 maps in Australia. I tried all and then was advised by Garmin.
SOURCE: Need manual
you can download the manual here
http://www8.garmin.com/manuals/1541_OwnersManual.pdf
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SOURCE: SISTEM SOFTWARE MISSING on my Garmin NUVI200 GPS
All Garmin users,
There is no easy solution for this except to return your unit to the nearest Garmin outlet. You need to have very special equipment called an E-Prom burner or writer which only Garmin have. With this equipment they re-programmed (restore) the operating system back on your specific Garmin unit and model.
The problem why anybody can't do it is because there is no way you can access your Garmin unit from a pc or mac if the operating system is lost or damage on your Garmin, for the simple reason your pc or mac can't reconize the device that is pluged in, because there are no communication platform between the two devices.
As simple as that, life with it or send your Garmin gps to an autherized professional Garmin dealer.
Marius Oosthuizen
Garmin dealer
South Africa
SOURCE: Webupdater won't detect Garmin unit
I have the same problem of the Nuvi 850 being recognized by webupdater. I downloaded 4.30 firmware update using this link http://www8.garmin.com/support/download_details.jsp?id=4043 plug the unit in and ran the update. It will ask you to disconnect once it is done. The unit will boot up after a few update progress bars. Plug it back in and launch webupdater.
Enjoy,
Fellow 850 owner.
SOURCE: Nuvi 200w map download and sd card
Guys and or ladies... I know that you have to create a folder named "GARMIN" in the sd card so the maps can be recognize. Maybe this solves your problem. Let me know if it works.
BR from Spain,
Carla
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