Have you tried nRF Toolbox - and the update instructions here: https://www.espruino.com/Bangle.js#firmware-updates
@ajkm 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.
Have you tried nRF Toolbox - and the update instructions here: https://www.espruino.com/Bangle.js#firmware-updates