C:\Users\sjkim3\Downloads\odroid-go-firmware-20181001\tools\esp32img>esptool.py write_flash 0 odroid-go-firmware-20181001.img esptool.py v2.5.1-dev Found 1 serial ports Serial port COM3 Connecting........_____....._____....._____....._____....._____....._____....._____ COM3 failed to connect: Failed to connect to Espressif device: Timed out waiting for packet header
A fatal error occurred: All of the 1 available serial ports could not connect to a Espressif device.