Latest OTA update designed to make checking blood oxygen levels a better experience

Samsung is currently rolling out an update to the Galaxy Watch 3 that among other improvements, will make using the SpO2 sensor a more reliable experience.

The R840XXU1BTK1 firmware update is being pushed out in Korea with a view to offering more stable measurements from the biometric sensor, promising better accuracy and improve the speed in which those blood oxygen measurements are generated.
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https://www.wareable.com/samsung/samsung-galaxy-watch-3-sp02-sensor-update-8172