Fenix 5x Plus problem (resolved)

Hi all, I had a problem after updating my Feniz 5x plus to firmware 19.10. I state that before the clock worked perfectly. Since I updated via Garmin Express I have a problem with calculating steps and monitoring heart rate. In practice they no longer work, not even the green lights of the sensor light up. The rest works perfectly! What could have happened? can a downgrade fix it?
Thank you all ;)