Fenix 6 Pro Solar Heart Rate Sensor doesn ´t work after firmware upgrade 21.00

Hi, 

After software upgrade to 21.00 the HR sensor stop working. No lights no measure... I tried soft and hard reset and event try to downgrade but it doesn´t fix the problem. I dont beleive it is a hw problem ´couse this morning iwas wearing the watch and its works perfectly. Any ideas ? thks in advance