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****************** Applicable conditions ******************

Note that this mode is only available if all of the following conditions are true:
1 Cannot boot up Can't plug in or unplug the USB by any means such as the power button, install/uninstall the battery to boot
2 Unable to upgrade the Arm Press and hold "F1" and press the power button to enter the upgrade Arm process
After all the above occurs, the specific performance of the device is that the USB power-on button will be turned on and there will be no other reaction (board).

****************** Causes of this situation ******************

1 Upgrade the Arm process interrupt, such as the upgrade process, unplug the USB
2 The power button is not released in time when the operation enters Dfu mode.

****************** Specific steps *****************

1 Remove the battery back cover and remove 2 batteries
2 Unplug the USB cable
3 Press and hold F1, plug in the USB cable and connect to the computer.
4 Release F1 immediately after the lower right corner (RUN/Stop) light flashes
5 Click the program "Start" button
**Note, please make sure the computer has been installed once Dfu drive