BTN2 not working on Bangle1, how to update firmware without button 2?

Can you feel a physical 'click' when you press the button in?

@Gordon
Yes, though I mean to hear an additional soft rattle, that isn't there with the other two buttons.

I've bought the watch from https://www.berrybase.de/neu/espruino-ba­ngle.js-smartwatch?c=2478 so I guess they'll be the first contact to handle a replacement/fix. For the fun of it, I'll probably peek inside during a quiet hour.

Thanks for your support!