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ZBook 15 G6 undervolting re-enable in BIOS
#1
Hello, I have an HP Zbook 15 G6 laptop, whose BIOS got updated and since then the processor can not be undervolted, not the fans can be controlled by 3rd party app like

NoteBook FanControl. I cannot downgrade it back, because it does not allow past a certain version.

I have dumped the full BIOS (2 of them) from the motherboard using a chip reader. Can anyone help me edit it, so the undervolting feature can be reenabled? Thank you!
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#2
(04-01-2021, 12:17 PM)Alyosha2001 Wrote: I cannot downgrade it back, because it does not allow past a certain version.

I have dumped the full BIOS (2 of them) from the motherboard using a chip reader. Can anyone help me edit it, so the undervolting feature can be reenabled?
Hi!
I can't help you with editing, but we are able to safely downgrade your bios.
Which version do you want to downgrade to?
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#3
I would like to downgrade to 01.02.02. It can be downloaded here: https://ftp.hp.com/pub/softpaq/sp99501-1...p99616.exe . I have a friend who owns a service and has chip writters, but he told me that the downloaded BIOS file is incomplete, so he cannot write it unless he has the full BIOS.

I have uploaded here:
http://bliss-video.go.ro/index.php/s/5gKX1c7ItS2RRuP
the full current BIOS that I have, which has been read from my motherboard, and has the FIVR locked.
Thank you for your time!

Whe I try to downgrade via the downloaded exe, after reboot I get a message ”BIOS Update denied. BIOS update denied by system policy.Canceling the system BIOS update”.


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#4
(04-01-2021, 01:49 PM)Alyosha2001 Wrote: Whe I try to downgrade via the downloaded exe, after reboot I get a message ”BIOS Update denied. BIOS update denied by system policy.Canceling the system BIOS update”.
If you want "01.02.02", then you need to be on version "01.04.05" or lower for downgrade to be allowed. You can't do without chip writers.

(04-01-2021, 01:49 PM)Alyosha2001 Wrote: I have a friend who owns a service and has chip writters, but he told me that the downloaded BIOS file is incomplete, so he cannot write it unless he has the full BIOS.
The only dump I found in the net is exactly the 01.02.02 (because It has Intel ME 12.0.45.1509).
[Image: dump.jpg]

But, unfortunately, it was accidentally pwed and has a different region from your id's in ME, which cannot be cleared due to the sign.
[Image: FIT.jpg]

In posts about a similar device, it is said that flashing a cleared EC can remove the password. So, I extracted the EC image from the update file.
Files DOWNLOAD
[Image: ec.jpg]
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