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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
Yes, I'm afraid updating by iPhone does seem a problem for some on modern iOS versions, but usually keeping retrying does work (it uploads a small bit at a time). There is a note on this on the firmware update instructions at https://www.espruino.com/Firmware+Update#nrf52 - but let me know if I can put it somewhere where it's clearer.
Glad you got the firmware updated in the end though. The App Loader method is by far the easiest/safest. But yes, you can update with SWD in worst case (https://www.espruino.com/Bangle.js2#hardware-swd) but that shouldn't ever be needed - really it doesn't make much sense to do that unless you're developing a custom firmware for the Bangle.
But back to:
Does this still happen with the new firmware? Freezes are usually extremely rare on Bangle.js. It's not just that the screen is locking (lock icon in top left) is it?