chart.series[0].update({ pointStart: newSeries[0].pointStart, data: newSeries[0].data }, true); //true / false to redraw code example

Example: chart.series[0].update({ pointStart: newSeries[0].pointStart, data: newSeries[0].data }, true); //true / false to redraw

chart.series[0].update({
    pointStart: newSeries[0].pointStart,
    data: newSeries[0].data
}, true); //true / false to redraw