There are some instructions at https://www.espruino.com/Bangle.js2#firmware-updates
But honestly I'd suggest holding off for a week or so until things calm down here. Your firmware is basically up to date apart from that issue.
@Gordon 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.
There are some instructions at https://www.espruino.com/Bangle.js2#firmware-updates
But honestly I'd suggest holding off for a week or so until things calm down here. Your firmware is basically up to date apart from that issue.