Hi! I have this Garmin Drive 52 with me, and it has no maps installed, so I downloaded Garmin Expressm and plugged in my Drive 52, and on the display of the Drive it said "USB connection Detected. Entering file transfer mode (countdown)" and when I let it count down or when I press "Continue" it just reboots back to the main menu, like a USB connection mode boot loop. And it doesnt show up in my PC or Garmin Express. I've tried both front USB ports, a back USB port, a USB hub too. I even tried a MacBook (running Windows though), if anyone could help me, that would be great!