That's indicating it's attained preboot mode. Updater.exe should detect it but you must be very quick to load Cure fw because these modern devices retain preboot only for a matter of seconds. Once it exits preboot mode it becomes 'bricked' again. Try this:
1. Load Cure fw (either full GarminCure3 or QuickCure3) to Updater.exe, select the radio button next to "USB Device" and leave the GUI visible on your desktop.
2. Plug a USB cable into a rear port of the PC. With the device fully OFF, hold the screen and power it on by plugging the miniUSB plug into the device.
3. Immediately you see the device detail populate the window to the right of "USB Device" click "OK" on Updater or hit the Enter key on your keyboard. Don't hesitate or it will drop preboot. Don't release the screen until Updater finishes.
4. If Updater completes and reports success then don't disconnect from PC, the device should become visible as a Mass Storage device allowing you to properly format it. Try to get a backup of existing files first however.
Let's know how you go.
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