I received a new map update in Aug 19th. I tried to download and update though USB. But during update it said" Update failed, USB is unplugged. System is going to turn off in 180 sec. Do you want to retry?". I tried to reinserting USB, turn off the car, load old update etc.. nothing is working. It keeps on playing the error message and gets rebooted to the same error! Any idea how can I fix this? The USB I used was a USB reader + micro SD card. Not sure that caused the issue.