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Z620 Workstation - Bios Rev. 3.88A Fn Buttons not working!

HP Recommended
HP Z620
Microsoft Windows 10 (64-bit)



i recently got a strange problem with the Bios on my HP620 Workstation.

Keyboard is "Microsoft 4000 Ergonomic Keyboard".


although the F5 / F10 Buttons are working normally in Windows 10, they do not work anymore in the system Bios,

means i cannot save the changes i make there. i can switch every option, from disabled to enabled for example,

but as i need to hit F5 or F10 to make/save the changes, and non of the Fn Keys works, i cannot change anything in Bios now.


what could that be?

Reason cannot be the Bios Version or the Keyboard, as i already made changes some months ago.


thanks for any help



Level 2
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maybe for your interest, in case this appears on some other systems:


restarts, manually installing new drivers, and reconnectings did not work, i simply switched mouse and keyboard, so 

windows updated the drivers, this solved the issue, seemed to be a port/driver issue

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