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  • I think that code will just get stuck at -1 and 24. This should work a bit better (untested):

    min: -24, 
    max: 23,
    step: 1,
    format: v => (v+24)%24,
    onchange: v => { /* same as above */ }
    

    As for why you aren't seeing your changes - a bit of a long shot, but you could be running into this issue. If that's the case, upgrading to a newer firmware version should help.

    Also, I assume you're using the espruino IDE to upload your changes to the watch? You might find it more convenient to clone the repository locally and test your changes using either apploader.js or a local server, as discussed in this thread.

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