Upgrade the firmware by SD card. It is easy and convenient to operate.This display board has higher compatibility. Users can select two work modes,they are UART serial port screen mode and 12864 screen mode Serial port screen mode supports two printing modes: SD card and U disk Reserve WIFI port, and WIFI function is realized by external WIFI module Reserve the extension port of filament breaking detection (FIL-DET);Reserve the extension port of automatic shutdown after printing (PS-ON) 2 sets of UART serial port extension ports are reserved for DIY use