'There are no USB devices available' message means the unit is not in preboot. If it can write to the card and display the logo it can reach preboot. Try this: Drag the rgn file onto updater.exe and leave it open and visible on your desktop. Select the radio button next to 'USB Device' on updater.exe. Plug a usb lead into a rear port of your PC [not into the nuvi yet]. Ensure the nuvi is fully OFF. Hold the upper LH corner of the screen and then plug in the mini usb to the nuvi, keep holding the screen. When you see the unit's detail appear in the window next to 'USB Device' click OK, still holding the screen at least until you see the word 'Loader' appear on the upper part of the screen. If you can't see the word because of the state of the logo pic, just keep holding until the process is finished.
PS: One more thing, you have got Garmin USB Drivers installed on that PC, i hope:
Code:
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