hello I have seen this happen specially when using the 4gb card that comes with the tool is like there is not enough room and something gets corrupted while updating or swapping cards if you have a pc with a card reader try using your pc/laptop and if you can get a 16 or 32 gb sd card even better do the procedure on your computer it will be much faster and less errors also use the ethernet cable not the wireless and erase all vehicles makes and download them again leave the chinese cars for last just in case hope this help maybe some else can help more on this issue your having good day