Button should be released as described, if you still keep holding it then it will reboot.
If you don't hold it then maybe your button is in fact stuck? See this http://forum.espruino.com/conversations/378516/ Do you see the bootloader ===== line going across the screen even if you don't hold the button? Then it is probably stuck being pressed.
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.
Button should be released as described, if you still keep holding it then it will reboot.
If you don't hold it then maybe your button is in fact stuck? See this
http://forum.espruino.com/conversations/378516/ Do you see the bootloader ===== line going across the screen even if you don't hold the button? Then it is probably stuck being pressed.