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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
You are flashing the espruino_2v10.102_magic3-dafit.bin file right? no, no workaround for that step, worked for me many times, yes try different Android device. Once you have first Espruino from the -dafit.bin then you can update bootloader by copy pasting the bootloader and updating UICR via IDE (step 6 in readme) and then you can use any other DFU tool - like nrfConnect. But for the first step with the DaFit .bin file format only DaFlasher works.
And BTW once you flash Espruino the screen is blank, you need to run some js code to use it.