Thanks, Billi, for such a quick help. I followed the instruction but it unfortunately does not solve the issue. When I disconnected and pressed the reset button, the green lights of both the home button and the charging light went on for about half an hour. The poor device became very very hot. But then both lights went off. That was it. Now the the reader will not turn on again even when I press reset. I also notice the battery sign is kind of *broken* (click
here to see the image)?
What do you guys think? Thanks!