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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.
@allObjects
Can take it upfront: GREEN LED will not go on... as did not the RED one as @jm already confirmed. Even if the green LED would be dead, the RED one would still pulse... which it never did. None of the button driven on and off of the working RED LED1 showed any change in behavior. RED LED1 gives only a single blink on power up.
When powered on, Espruino checks as some of the first things whether button
BTN, BTN1is pressed andC13isH(all the same)... and if it is, it goes to boot loader mode, and if not, it resumes normal operation. Pressing and holding the button afterwards will never get it back to the state where boot loader mode can be entered (not even by code, I expect, to prevent erroneous, running away code could push it into this - for the application - dead mode).