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Every Charge 6 runs between 170 to 190 BPM. It reads my cadence instead of HR

I upgraded from a Charge 5 to Charge 6, and the Charge 6 heart rate data is wrong all the time while the Charge 5 HR data was mostly good.

Sometimes, during the first minutes of a run, the heart rate recorded is in the ballpark but it always go back to indicating the current cadence as the heart rate value. It even goes up and down accordingly.

I'm wearing an arm band OHR (Polar Verity Sense) or ECG chest strap (Polar H10) connected to a sports watch to record accurate heart rate data at the same time, since the Charge 6 is completely wrong.

All Fitbit fitness and wellness recommendations are wrong as a result, since a low intensity 3h long run is believed to be a max effort above my metabolic max heart rate that would send me to the ER every other day.
I wish I could at least connect an external HR sensor to the Fitbit but that's not supported.

Could Fitbit look into it? As a developer and tech fitness enthusiast I'd be happy to help with identifying why this wearable cadence locks all the time during any running activity, any pace, any intensity, on asphalt, on trails...
I can guarantee that would be valuable data to improve the HR sensor algorithm.

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