I think it will be a power supply issue. When espurino on the esp8266 boots for the first time, the AP mode is on which draws more current.
From memory the ftdi boards can can't supply enough current.
@Wilberforce started
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.
I think it will be a power supply issue. When espurino on the esp8266 boots for the first time, the AP mode is on which draws more current.
From memory the ftdi boards can can't supply enough current.