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HP ZBook Firefly 15.6 inch G8 Mobile Workstation PC (1G3U2AV)

I had a second external monitor working over USB-C port on my Elitebook for the last 2+ years, 

After a Firmware Upgrade this week, it stopped working.
The USB-C Port can charge. The Monitor works directly with an HDMI cable.
But connecting the monitor with HDMI to a USBC  stopped working,

 

The second Monitor is not recognized anywhere anymore.

 

Please advise ASAP

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