It is set by default and we tested it is proper setting for printing, you don’t have to change it actually. If you really need to change it, please refer to the following method to update the latest firmware
Mars 4 DLP V1.2.3 firmware :
https://drive.google.com/drive/folders/1pSyzC9tcbSJlyYTV_yA1EHs2vsgRSxjD?usp=share_link
Method:
Copy the files in the link below to the USB Drive, the USB Drive must be in FAT32 format, the memory is less than 16GB, and the USB2.0 series. Do not create additional folders in the USB Drive. Insert the USB Drive into the printer and restart the printer to update automatically. After the update is complete, you need to remove the USB Drive and restart the machine.