Thanks apolyps3! Question.... If I follow your description then I unpack the RAR file on the SD card. But then the root folder "/" has nofiles like autorun or something like that, just the mentioned folders with the content. Is that right? Since I did that and the device does not start from SD then.
p.s. the Fat32 formatted SD card has 3 other folders from a dashcam: photos,videos and events from which I think it should not matter.