Replace it with an SD or TF card of more than 8G (preferably 16g): 1. Download the new main program and extract it to the SD/TF root directory. Generally, there are two folders (NaviOne, ui) and 1 boot file, maplaunch.ini；; 2. Download a new map (standard version, deluxe version or flagship version) according to your navigator; 3. Unzip the map and copy it to the NaviOne folder; 4. Download special software and modify it according to your navigator port and speed. The file name is naviconfig.dll and the path is navione/naviresfile/naviconfig.dll.: 5. Open the boot file maplaunch.ini with Notepad software, and check whether the boot paths are consistent, then you can get on the computer.