A new card should work out of the box, otherwise format on PC as FAT32.
If you still have issues, try to format in a digital camera or Android/Linux system with FAT32 and Full/deep format.
Some times Windows writes extra data in the SD/Partition that the old DS708 does not like.
But we aware.
Use a new SD !
708 is dead, no updates or suppport provided by Autel anymore !
If you bought it as working, return to seller and get money back.