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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.
@fanoush
Yes the button is stuck, also the bootloader tells you to release button to enter DFU. Bootloader and Espruino firmware are two separate parts and both read the button pin as pressed so it is not a software issue. Well, unless you recompiled both yourself and changed BTN1 pin.
Can be moisture or mechanical problem.