Did you just accidentally plug the battery in while holding the button down? That's the problem 99% of the time.
I found out with someone that it has something to do with Android, on the PC everything works without problems
@Gordon 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.
Did you just accidentally plug the battery in while holding the button down? That's the problem 99% of the time.