Mine is working now. Found a 2 gig flash stick and under zipped the file. (I didn't know I had to or not. So I left both zip and unzipped file on flash stick. ) first attempt the dash froze. Then I tried again. The USB button was highlighted. 6 minutes later the dash rebooted and connected. Working now
Not a great job Sony, but thank you. I was about to trash this device.