How To Flash Latest MicroPython

Install esptool from Github

Download the latest MicroPython for ESP8266 from MicroPython

Run the following

./esptool.py –port /dev/ttyUSB0 erase_flash

./esptool.py –port /dev/ttyUSB0 write_flash –flash_size=1MB -fm dout 0 esp8266-20171101-v1.9.3.bin