When you flashed the cure fw, did you keep firm constant pressure on the top LH corner of the screen at least until you saw 'Loader' appear on the unit's screen? If you don't hold firmly until that point, the unit will try again to go to MSM which it cannot do. Is there any error message from updater.exe after the unsuccessful flash attempt when you hear the Windows 'ding' sounds?
Try to access preboot after you have the cure fw loaded to updater.exe with the radio button selected for 'USB device'. Hold the upper LH screen corner and then plug in the usb lead to the nuvi [use a back usb port of your PC if possible]. Immediately you see the nuvi details appear in the window next to 'USB device', press OK on updater.exe and keep holding the screen.
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