I removed SD card to view videos. Thinkware software updated the firmware on the SD Card. I put the SD card into the F770 and it gave me the message that it was updating the firmware. Once this happened, I had no power to the dash cam again. I contacted Thinkware customer service in the United States. The representative told me that I was the fourth person to call in with this problem. I was able to return the Dash Cam since it was under warranty. I'm still waiting for the replacement. DO NOT UPDATE YOUR FIRMWARE.