The described behavior where the device is seen in Device Manager but not in Windows Explorer means it's not connected in Mass Storage Mode of course. Rather it's connected in Garmin Mode, also referred to as preboot mode or boot block for various devices. If it stays permanently connected in that mode until manually removed then it may well be an older-style Garmin Mode device which only has flashable 'regions' rather than a visible file system but i'm mot familiar with that specific unit.



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