C:\Espressif\utils\ESP8266>esptool.exe -h
usage: esptool [-h] [--port PORT] [--baud BAUD]
{load_ram,dump_mem,read_mem,write_mem,write_flash,run,image_info,make_image,elf2image,read_mac,
flash_id,read_flash,erase_flash}
...
ESP8266 ROM Bootloader Utility
positional...