Problem: Screen display "Please wait" when selected print menu. 

1. Select Preheat menu, check the temperature. If it is 0 ℃, you need to update firmware. 

2.If the temperature is normal, and the XYZ axis can move, please kindly replace the SD card. 

How to update the fireware?

Please reference to [[http://wiki.malyansys.com/doku.php?id=home&#firmware_for_m100_m200|update procedure]]