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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.
@Gordon
Are you able to connect to it when it's in DFU mode? The IDE/App Loader won't connect in that case, you'll have to use the
DFUapp: https://www.espruino.com/Firmware+Update#nrf52If you were on an old (pre-2v22) firmware, there were some changes in 2v22 that made Bluetooth more reliable on some devices (if the crystal oscillator wasn't running as accurately as we'd assumed).
I guess it's possible that you have a bluetooth hardware problem on your Bangle, although the fact that it seems to at least start connecting makes me feel like it's less likely. You could try pinching the Bangle in the top right corner and see if that improves the connection (there's a sprung connection to the aerial inside the watch there, and I've seen a few devices where it can lose contact with the aerial)