Hi guys as it was a bit dificult to find a straightforward solution I just write a quick recap on how to fix de issue.
Board : NodeMcu ESP8266 ESP-12E CP2102
computer : Mac OS Sierre 10.12.6
Error that I got "Wifi module not found" and impossible to comunicate with the board.
How I fixed it :
I reflashed the board with this settings :
files are from the folder
esptool.py --port /dev/cu.SLAB_USBtoUART --baud 115200 write_flash --flash_freq 40m --flash_mode dio --flash_size 4MB 0x00000 "boot_v1.6.bin" 0x1000 espruino_esp8266_user1.bin 0x3FC000 esp_init_data_default.bin 0x37E000 blank.bin
NB : You maybe have to change the port
Have a nice day and enjoy
PS : I wrote this topic with more "SEO" keyword to be sure this will be more visible, and to help more people :)