Or:
Load RGN file to updater. exe and have it visible on desktop with radio button selected for 'USB Device'. Start with nuvi fully OFF. Have USB lead plugged into rear port of PC, press and hold upper LH corner of screen then plug usb lead into nuvi to power it. Immediately nuvi details appear in window next to 'USB device' on updater.exe, click OK or just press enter on kb. Hold screen at least until 'Loader' appears on screen, or until entire process ends.