2.How to upgrade the firmware of M3 Pro?

Upgrade when the M3 Pro is powered on: Copy the firmware file to the root directory of the Micro SD card, go to system settings and click system upgrade. Note that do not unzip the file.

Upgrade when the M3 Pro is powered off: Copy the firmware file to the root directory of the Micro SD card, and then insert the card into the M3 Pro. Hold both the volume up and power button to enter the upgrade menu, and then release the button.