B50 Hdmi stopped working

Hi, my B50 amp stopped sending an Hdmi signal to my TV. The optical connection still works.
What can I do to fix this?

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Is your TV from the TCL company? My TV 43C635X2 stopped working CEC-ARC since the last automatic firmware update of my television. Only Spdif/Optical

The same thing has happened to me. B50 with firmware 52 worked perfectly and volume control from the TV remote. One day it stopped working. My tv is TCL 43" How can I restart restore Arylic B50?

I guess to fix the malfunction you need to set the sound settings to PCM mode. Maybe other modes were installed during the update. B50 only accepts this mode.