Solar Charge is not working

Hello Garmin, 

I had download automatically the 20.50 and since I have the solar charge unable to charge, also the graph is flat, solar wheel is not working too, I'm unable to rollback to the 20.30, could you please help ? Do you know how I can fix this ? I don't see any GUPDATE.GCD in the Fenix to get the 20.30

Could you please help and advise ? 

Thanks