@navas
if you like to flash 1v90 you need to use boot_v1.5 and not boot_v1.6 which comes with versions >= 1v88 of Espruino for ESPs
Any clue where I can find boot_v1.5 file? Link you posted is dead now. :(
@stevo 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.
@navas
if you like to flash 1v90 you need to use boot_v1.5 and not boot_v1.6 which comes with versions >= 1v88 of Espruino for ESPs