I use this way:
Switch the board to bootloader mode and then use nRF toolbox app to flash the new firmware as zip.
@MaBe 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.
I use this way:
Switch the board to bootloader mode and then use nRF toolbox app to flash the new firmware as zip.