Sorry I wasn't able to do proper workout but I can confirm that z axis is broken and constantly shows
Unless a flatten the battery reset fixes it, it looks like a broken accelerometer.
In order for the step counter to work it uses SQRT(X^2 + Y^2 + Z^2).
Step counters that only one axis tend to stop working in certain positions - eg one of the Garmin (£500) smartwatch wont count steps if you walk with sticks.
I will flatten battery again. Previous attempt not helped as i wrote before.
I am not giving up but in the meantime I contacted BerryBase as this was official seler mentioned on website.
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