Since upgrade to firmware 27.14, the inclination and ascent values give funny values. E.g. -24% when I am on a +11% climb, or +18% when I am on a -5% decent. Figures jump around all the time. Following that, the ascent values are also way off. Irritating to say the the least. Can I roll back to a previous version, or do I have to wait for a corrected next one?