Ensure your phone is connected to the Z40's Wi-Fi network (Default SSID: DDPAI_Z40_XXXX , Password: 1234567890 ).
Launch the app and connect your smartphone to the Z40's built-in Wi-Fi network. Ddpai Z40 Firmware Download
Use a computer to format your microSD card to FAT32. Ensure your phone is connected to the Z40's