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Microsoft Windows 10 (64-bit)

I tried to update a Z6 G4 bios from P60 v02.82 to the latest version from HP Support Assistant. But the machine would not start but keeps in a rebooting loop state, where there is not contact to the USB or PS2. The monitor do not show anything.

 

I tried to clear CMOS and I have tried to take out the battery. I even tried to make a recovery bios USB, with v02.82, but the USB can not be read.

 

What to do?

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