I encounter exactly the same issue: after failing at updating the firmware of my linkit one board (I chose a wrong port number as far as I remember), when plugged, the board stays connected for 1-2 seconds before disappearing. And the cycle is repeated after 35 seconds when I leave the cable connected.
I note that several people seem to face the same problem, does anyone have a solution ?
Is there a way for applying a "hardware factory reset" to this board?
Many thanks in advance for your help