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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.
@WizardStan
The problem I'm having with the 2v12 is definitely app based, I assume there's some new functions in later firmware that some apps use which cause them to fail.
I tried manually downgrading Anton clock as I mentioned and that was causing it's own problems, so instead I installed a different watch face ("Simple Clock") and that seems to be working now.
Here's the interesting thing though. My battery was at 10% on v19 when I decided to risk downgrading to v12. When it completed (and I did a full reset of the watch) it started reporting a battery level of 45%. Is that ringing a bell? Did you change the way battery level is measured at some point? I'm going to let this keep running; if I get another four days that'll be... something.
I've got a lot more experimentation to do, the mystery deepens. Too bad it takes days to learn anything.