As suggested, firstly you must know your device HWID and you can retrieve it in GarminDevice.xml in Garmin folder.
nuvi 3790 example:If you get Garmin logo you can use updater, must just know how to use it correctly.<PartNumber>006-B1101-00</PartNumber>
Correct usage of Updater.exe here:
[Only registered and activated users can see links. ]
Download correct firmware according to your device HWID and flash it.Remove any Gupdate.gcd in nuvi first, if you can
Badit's never updatedfirmware updates remove bugs.
If nothing works use kunix's cure:
[Only registered and activated users can see links. ]
If kunix's cure doesnt work too, send Alexander a pm.
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