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HP Zbook Studio G8

Hi all. 

I'm a system support engineer based out  of the uk and wondered if anyone had any information on the following issue. 

When updating the bios to the newest version, the dock stops working correctly. It now only works as a charger. Ethernet, usb and display have broken. 

I've tried to find an older HP bios to attempt a downgrade but cannot find any on hps website. 
I've powercycled, updated windows, drivers, disabled power saving modes and selective suspend for usb's, ran support assistant, power cycled the dock, changed thunderbolt settings in bios, used a different HP dock. Nothing seems to work. 


Everything worked fine before the bios update. Any ideas guys? 


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