Ok, it might just be that you don't have [Only registered and activated users can see links. ] loaded, that's needed to even connect in preboot. You can check if it's recognized in preboot by leaving Device Manager open on your desktop when you connect, it should show up under "GARMIN Devices". Also be very sure that your 1490 has HWID 1104 because the other possible HWID for 14xx devices is 0972. Connect it in preboot to check with G7ToWin or if you have a file system backup look at its GarminDevice.xml file found in the 'Garmin' folder. More info here: [Only registered and activated users can see links. ].

Bootlooping bricked devices can be tricky to get into preboot, however once a flash is started they will usually hold preboot no problem. Best to have Updater.exe (or G7ToWin if checking HWID that way) already open with the RGN file loaded to it and it's GUI visible on your desktop so that you can quickly initiate the process. Then follow this:
  • Ensure the nuvi is completely OFF, you may need to hold down the power button for up to 10 or even ~30 seconds to force it off.
  • Plug a 'known-good' miniUSB cable directly into a REAR port of a desktop PC (USB2 only not USB3 and no hub or front port).
  • Hold the top LH corner of the nuvi screen while plugging the cable into it watching the app's GUI closely.
  • IMMEDIATELY the nuvi is recognized start the process and hold the screen until finished.

If you miss it start again ensuring the device is OFF. Normally a healthy 1xxx device will hold preboot for about half a minute but a bootlooping device may drop it in as little as a couple of seconds so you'll then need to be very fast and also persistent.