HP ZBook 17 Mobile Workstation (not G2) BIOS Downgrade - (Pre-Spectre & Pre-Meltdown)

[xaxex]

Hi, can someone please help with BIOS downgrade?

I have recently figured that the meltdown and spectre patches are taking toll on CPU. I know about grc tool but that will only fix the Windows/OS patches. The hardware ones, which are included in BIOS, will still be limiting CPU.

Currently, the laptop has BIOS version 01.47 Rev.A. I want to downgrade to 01.40 Rev.A which is from January 2018. I am pretty confident that HP had not released patches then.


All the latest & previous BIOS versions of this laptop are available here:
https://support.hp.com/us-en/drivers...tation/5387509



I tried using the normal way. Downloaded the BIOS files and tried to install within Windows. But it shows following error:



Tried the same from BIOS using USB I created with HP BIOS utility, and it was same error about corruption.

Its weird since the BIOS is downloaded from HP website. I tried several versions, but it seems like HP is not allowing downgrade.

I have extracted the BIOS and there is a BIN file. Is there a BIOS flash utility that can help me flash this BIN file?

What can I do to downgrade?

[RethoricalCheese]

Re: HP ZBook 17 Mobile Workstation (not G2) BIOS Downgrade - (Pre-Spectre & Pre-Meltd

Upload your original dump and the bios update you want.

So.. You need a programmer for that.

[xaxex]

Re: HP ZBook 17 Mobile Workstation (not G2) BIOS Downgrade - (Pre-Spectre & Pre-Meltd

Upload your original dump and the bios update you want.

So.. You need a programmer for that.

My laptop is fully functional. Is there a utility to flash the BIN image to BIOS without the security checks? I think this may solve the problem. Or do I have to use a progammer?

I have some experience with thinkpad lenovo t440p unlock, which involved CH341a programmer and bios dump. But I followed tutorial. I wish the process is similar with zbook

[RethoricalCheese]

Re: HP ZBook 17 Mobile Workstation (not G2) BIOS Downgrade - (Pre-Spectre & Pre-Meltd

Then use that experience and post files