I have an SM-R800 and have come to find our the heart rate monitor is way off. I have a pacemaker that gets read monthly to see if everything is okay. It turns out the watch is not close. It showed I had a reading of 120bpm that lasted two hours. The watch only read 106bpm at the end of the two hours and the other readings during the episode were in the 60s. Cam the watch be updated to reflect better accuracy?