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Keyboard not working after Win10 FU1903

Z 600
Microsoft Windows 10 (64-bit)

Hallo there,
I have installed the FU1903 on my HP Z600 WS (offered by MS) and since then (~ 2 month ago) I'm not able to log in into the system, since the Keyboard is not working at the moment I need to hit Ctrl+Alt+Del to get into the Login-Screen.

I'm also not able to open the on-screen-keyboard because I need to enter Ctrl+Alt+Del first.


And: of course my keyboard is OK since I can enter the BIOS and change settings there etc. and it is a wired one.

But I also tried a wireless one which works perfect with my Linux-PC and it works perfect while boot-sequence and I can enter the BIOS, as well as with the wired one. So, I don't think, it is a KB-Issue.


Any useful idea is welcome.



Thanks in advance


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