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Is it possible to enable R-R recording with FR 35?

Hi, I want to analyze the hr-data from my FR 35 with Kubios Premium (a software for analyzing heart rate variability), but when I want to open the .fit-file in Kubios, the following message pops up: "RR-Data not found". Is it possible to manually enable R-R / interbeat interval (IBI)-recording on my watch?