In the navigation main interface-file management-click search-enter 7253 and then click search, you will find the path down the navigation path from the background management interface, and then take the map to the SD card. Format sd card before copying. Then change the name of the SD card to the first file name of the path you wrote down. Then bring the map into the exam and open the navigation background in the same way. Modify the path of FLASH /RTNavi.exe in the SD card, and then click Upgrade. Mine does this. Wish you success!