Upgrade description
1) Put the .bin file into the root directory of the USB flash drive of the device, and then power on the device.
2) During the upgrade process, the green and red lights flash alternately, and the indicator light will be extinguished several times;
3) After the upgrade is completed, the device will automatically restart;
4) Wait for 5 minutes, or the indicator remains constant, and the device works properly after you press the button. You can check the firmware version after connecting the device using smartgo

Note: Do not connect external power supply, and the battery level is not less than 30%, otherwise the upgrade will not be performed!