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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
Which tracker? BTW beware that you also need to erase the memory before writing,the file converter generated code does not do it for you.
Here is another example that rewrites bootloader in DK08 smartwatch https://github.com/fanoush/ds-d6/blob/master/espruino/DFU/DK08/DK08-bootloader.txt