Screen update instructions
1. Insert DWIN_SET and private from the display firmware into the tf card.
2. Insert the tf card into the screen card slot.
3. Reboot the machine and wait for completion.
Mainboard update instructions
1. Insert the STM32F4_UPDATE folder in the motherboard firmware into the SD card.
2. Insert the SD card into the machine slot.
3. Reboot and wait for the update to finish.