This instruction was tested on Windows 10. Some users reported it worked on Windows 7 too.
You might need to install the USB-UART CP2104 VCP driver for Windows when the ODROID turns on.
VCP driver for Windows
You need to check the COM port number with Device Manager.
Refer this guide.

Firmware binary package 2018-07-27
And then, you need to extract the file on your work directory.

flash_download_tools_v3.6.5_0.zip

You must erase the flash of ESP32 before uploading a new firmware. Note that you have to turn the ODROID on first.
Select parameters as shown in the below picture and check your COM port.
Then, click ERASE button.

Select binaries and input parameters as shown in the below picture and check your COM port.
You have to select 3 items. It turns green if you check.

• bootloader.bin 0x1000
• partitions.bin 0x8000
• odroid-go-firmware.bin 0x10000

Then, click START button.

If you're trying to flash a firmware version before 180727, check the input addresses in the picture below.

host

$ sudo apt install python-pip
$ sudo pip install esptool pyserial

Get “odroid-go-firmware-bin-release-20180727.tgz” from this link.
Firmware binary package 2018-07-27
Exctract the file.

host

$ cd ~/work/
$ tar xvfz odroid-go-firmware-bin-20180727.tgz
$ cd odroid-go-firmware-bin

Connect your ODROID-GO to HOST-PC. Then, you should check that your serial node is like “/dev/ttyUSB0” or “/dev/ttyUSB1”

host

$ ls /dev/ttyUSB*
/dev/ttyUSB0

Turn on your ODROID-GO. Then, type the following.

host

$ ./eraseflash.sh
$ ./flashall.sh