I manually dropped a 2017 map in my 3760 and i didn't update the software before doing that. now when i start up, it loops and restarts. I press the upperleft to get it into pre-boot mode then connect to my pc while the garmin updater is searching for device, but it doesn't connect. i can hear it try to connect, then fail, then restarts. Even connecting in Mass Storage Mode, it just reboots and never connects.