To be able to flash, open Betaflight home page and install the 2 driver software/updates:
- zadig-2.3
- CP210x_Universal_Windows_Driver
update both driver to WinUSB (v6.1.7600.16385) in Zadig
then load the firmware (Betaflight F4 V2.0) to the drone by holding the bootloader button on the drone, plug in the micro usb, then flash the firmware into the flight controller, all while holding the bootloader button on the drone.
if unable to connect to the betaflight after flashing, it meant that the driver is in the wrong setting, follow this tutorial to change the device driver to “Microsoft USB serial port”
after that, reconnect the drone to beta flight and it should connect.
If the Throttle and is reversed(up is lower value and vice versa), simply open the battery cover of the controller and push the channel 3 switch up.