Enable R-R recording on Garmin 910XT
Turn on your device and enter the Menu. Now press UP and DOWN for 10 times. You will enter the so-called diagnostic menu. Select and change HRV to enable HRV data recording.
This works for Garmin FR 620 as well.
We assume no responsibility for possible problems! You do this on your own risk. (Anyway, we enabled HRV on our devices as well and did not experience any issues so far.)
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