Try this for pre-boot mode.
Load garmin drivers from Garmin.com
With GPS off and not connected to anything.
Start updater.exe on the PC, Connect usb cable to the pc but not to the nuvi.
Place and hold your finger on the top left hand corner of the touch screen.
Now plug in USB cable into the Nuvi.
After a while you should here a sound from the PC and see your nuvi in Updater.exe
If your Nuvi can start to the main menu.
See post below by Catymag.
If it cannot start to the main menu try above.



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