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BIOS not starting after restart before attempted bios update which never started

HP Recommended
Zbook 17 g6
Microsoft Windows 10 (64-bit)

I downloaded and installed the recommended update for the BIOS. The laptop restarts but never actually reached the installation phase.

The bios is not starting anymore and it is stuck at the "protected by hp sure run" screen 

I tryed:


Restarting by removing batteries

Restarting and pressing Windows + B button

Ditto with USB stick containing recovery BIOS 

Restarting and pressing Windows + V button 

Also with USB Stick 

I deactivated Bitlocker on an external PC of the main hard drive but even with it it never actually reaches the bios 


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