Bangle.js time steadiness

Nope - afraid E.getRTCPrescaler is just for STM32s

(A more serious reboot seems to replace the time with a default time.)

Hmm. Are you running firmware 2v09 or not? I thought I'd fixed this in the most recent firmwares.

Would the script be more likely to work as desired if embedded into the watch's own script?

Maybe... However it should work. Maybe you could add something to the script so you can detect if it's working. Like maybe just add the code _MYSCRIPT_=1 to the end of what you upload.

Then you can log in with the IDE and see if typing _MYSCRIPT_ on the left-hand side actually returns 1 (it working) or a ReferenceError (it not loaded)