I did factory reset last night, it went to old WF version. Room temperature was 25C . Before rest it was reading 19C . After reset temperatures reading was 27C (much more accurate.
Went for a ride (1.5h) outside temperatures was around 14C, Wahoo was displaying 11-12C whole time. Which is not bad considering i was moving quite fast, ( average 34km/h) .
Today i've updated the unit to latest version. Temp reading went to shit again. it's cold outside, only 10C, but wahooo displays 2C now :D.
Now i left woth two options:
* I can downgrade it again and ignore Fw updates, but i use garmin varia and latest updates makes much more use of it ;
* Or get Garmin edge with mediocre interfacer ;