The problem it seems is that the device is dropping out of preboot before the flash is fully established, you can see in the second image under your point '3' that its details have disappeared from the window to the right of 'USB Device'. Bootlooping devices like yours can be tricky to catch and hold in preboot to get a flash established, so speed is of the essence as is timing and a bit of luck. Patience and persistence is key if the flash fails, it may take many attempts to find the right moment but you can greatly increase the chances by doing things quickly and in the right order to fluke an initiation. Once a flash is properly initiated (with data packet exchange to and from Updater) the device will hold preboot and not re-start unless the connection is physically broken. Your hack with the rubber while clever isn't really really necessary. If you hold the device in your left hand with your fingers on the back of the device and your left thumb pressed in the LH top corner of the screen it allows you to firmly control and move the device around while leaving your right hand free to connect the USB cable in a timely manner. There's a correct sequence for things to be done because the period it will stay in preboot is now extremely limited due to the bootlooping behavior. Usually 1xxx devices do have a 30 second preboot opportunity which is long compared to some other series however in your case it may only be around a couple of seconds before it re-starts and therefore interrupts preboot.

Before attempting to put the Garmin into preboot, follow this:
  • Load the cure RGN into Updater.exe
  • Leave Updater's GUI open and visible on your PC's screen with the radio button next to "USB Device" selected

Now turn your attention to the Garmin:
  • Ensure the device is fully OFF. Force it off if necessary by holding the power button down.
  • Plug a 'known-good' USB cable into a USB2 port of a Windows computer (avoid using a hub or a USB3 port or a front port of a desktop PC)
  • Apply pressure to the device screen and with your right hand plug the USB cable into the device's miniUSB socket (that will power it on) then move your hand quickly to the mouse while watching Updater's GUI on the PC screen
  • Immediately hit the 'OK' button on Updater's GUI (or just hit the Enter key of your keyboard) when you see the window to the right of 'USB Device' on the GUI populated
  • Move the cursor immediately to the 'Yes' button on the message about same software version and quickly click it
  • Keep the firm steady pressure on the screen while the flash initiates, if you don't do that it will fail for sure. Once you see 'Software Loading' or similar message on the device screen you can relax the pressure but if in doubt just hold until 'success' message is displayed by Updater


The device should now attempt to reboot and stick on the logo screen but have Mass Storage Mode enabled so you can delete the corrupt files or as a last resort properly re-format it, but only if absolutely necessary. [Only registered and activated users can see links. ]