After upgrading to 6.0 firmware, my 6S Pro shows HR values much higher than the real values, when I am in an activity, like runing or cardio. This renders the watch almost useless, because now, all calculated values which use the HR are crap. I saw that the announced 6.10 firmware only addresses a small wifi bug, but no word about HR problems, which seem to be very common. Is there any way to do a downgrade of the firmware?