Caty is right I have Nuvi 765 and I just tried to flash rgn file.
Execute updater.exe and drop on it an appropriate rgn file. Select USB device on it. After that all the time you must see program on PC.
1.Turn off your Nuvi and disconnect USB cable from Nuvi (USB cable still connected to PC)
2. Hold your finger ANYWHERE on screen.
3. Slide power ON and then immediately to LOCK position
4. Then still holding finger on screen connect USB cable. For this you have 30 seconds.
5. In program updater.exe for a short time your device UnitID appears in field near USB cable selection. Quickly press OK
6. Release finger from screen and wait until updater uploads rgn file.
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