Modern Garmin devices are tricky to preboot but even more so when bricked. Being organised in advance is essential. Have the cure fw loaded to Updater.exe with the radio button next to 'USB Device' selected. Have Updater's GUI visible on your desktop with your mouse cursor positioned over 'OK' on the GUI.
Use your left thumb rather than your fingertip as described in [Only registered and activated users can see links. ]. A bricked device will have to be forced off by holding the power button for 8-10 seconds. You must be well-prepared as it will then likely power itself back on after a few seconds so in that short time you must quickly plug the microUSB into it, having previously plugged the other end of the cable directly onto one of the PC's REAR ports (not thru a hub). The very instant you see the Garmin logo appear (not before or after!) press your thumb-pad firmly in place watching the GUI. When the device details appear in the window next to 'USB Device' IMMEDIATELY click OK (or alternatively hit the enter key on your KB) and keep the firm steady pressure on the screen until the flash finishes or at least until 'Software Loading' shows instead of 'System' dancing on the screen. Below is a pic of my 3597 in preboot, it took me only 2 attempts this time so I could take a photo but when I first tried to do it a couple of years back it must have taken a dozen attempts. Timing is everything. Good luck.
[Only registered and activated users can see links. ]
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