Good news,We have got the easy way to update your Tronsmart Car DVR GS9000 tested by Geekbuying.
First,you should format your TF Card.
Then ,Copy the stock firmware to your TF Card,and open your DVR.
Stock firmware download link:http://www.mediafire.com/download/6bmx6kne86sjptw/GS9000_CVFW_20130223_1_GPS_%E5%88%B7%E6%9C%BA.rar