As far as I'm aware ..._user2.bin is only used when flashing over wifi. To flash via serial, depending on ES8266 variant you will always need .._user1.bin, boot...bin, and blank.bin.
The flashing command will vary. There's a README in the archive with more info on the variations
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
ok, What is difference between the files ( espruino_esp8266_user1.bin ) and ( espruino_esp8266_user2.bin ) ?
Thank you