Sonoff Installation

I'm using version 2v00.17 on my Sonoff.
Have downloaded espruino_2v00.17_esp8266.tgz.
esptool.py --port /dev/ttyUSB0 erase_flash
cleans sonoff,
and

root=$(pwd)/espruino_2v00.17_esp8266
esptool.py --port /dev/ttyUSB0 --baud 230400 write_flash \
  --flash_freq 40m --flash_mode qio --flash_size 512KB \
  0x00000 $ root/boot_v1.6.bin \
  0x01000 $ root/espruino_esp8266_user1.bin \
  0x7C000 $ root/esp_init_data_default.bin \
  0x7E000 $ root/blank.bin
installs on Sonoff.

> Reset ();
= undefined
  ____ _
| __ | ___ ___ ___ _ _ | _ | ___ ___
| __ | _ - | . | _ | | | | | . |
| ____ | ___ | _ | _ | | ___ | _ | _ | _ | ___ |
          | _ | espruino.com
  2v00.17 (c) 2018 G.Williams
Espruino is open source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
Flash folder 512KB: 256/256, manuf 0xe0 chip 0x4014
>