What to do when A5S can't read the SD card

This problem is that there are too much files in the  SD card.

Firstly, format the SD card by choosing "FAT32" default.

Secondly, download the testing file from our official website, print again and see if it will happen again.

Thirdly, what i mentioned above don't work, it indicates that your SD card need to be changed.

Thanks.