Hmm, there is something weird about the Intel CSME 12.0 Consumer PCH-H B,A Firmware v12.0.55.1521.
As usual, I compiled the image with FIT, all well, but when I try to flash I get this error :

Error 499: Update to Image with lower ARB SVN is not allowed.

But ARB SVN is supposed to be 6 for both, so ... what is going on ?

That is funny, lol. Good one, Intel.
But thank you for posting everything, really appreciated :)

Yes, that was what I supposed and why I asked before. Other branch, but 12.0.49 is newer than 12.0.55 ...

Hmm, updating Intel CSME Consumer PCH-H D,A Firmware from 11.8.70.3626 to 11.8.71.3630 breaks the ability of the motherboard to overclock non-K processor (ASUS Z170-P + i7-6700 ES)

You are right Fernando but there could be a problem with some mobos like Gigabyte which cannot be ignored. OEMkey or some other factor? More troubleshooting needed!

After flashing my ASUS ROG Strix Z270H(7700K CPU) to v11.8.71.3630 if I overclock the system (by activating XMP for example) the PC can no longer boot up and I have to Clear CMOS to get back into UEFI. Any help on how to rectify this would be appreciated (Help that doesn't involve just downgrading back to 11.8.70.3626 etc). Thank you kindly.

I also checked with the Intel utility for Linux a Intel (R) Core (TM) i5-7500 CPU @ 3.40GHz with Intel CSME 11.8 Consumer PCH-H Firmware v11.8.71.3630

Zitat

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Intel(R) CSME Version Detection Tool
Copyright(C) 2017-2019, Intel Corporation, All rights reserved.

Application Version: 2.0.6.0
Scan date: 2020-01-09 18:47:01 GMT

*** Host Computer Information ***
Name: <...>
Manufacturer: ASUSTeK COMPUTER INC.
Model: Z170-WS
Processor Name: Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz
OS Version: Slackware <...> (5.4.8)

*** Intel(R) ME Information ***
Engine: Intel(R) Converged Security and Management Engine
Version: 11.8.70.3626

*** Risk Assessment ***
Based on the analysis performed by this tool: This system is not vulnerable. It has already been patched.

For more information refer to the Intel(R) CSME Version Detection Tool User Guide
or the related Intel Security Advisory list at:
https://www.intel.com/content/www/us/en/...chnologies.html

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What is strange is that in your case the utility considers version 11.8.70.3626 vulnerable and in my case NO.
I can assume that both versions 11.8.70.3626 and 11.8.71.3630 are considered safe especially since they have the same VCN -> 284 so the changes between versions are not related to security.
However, it is strange that we get different results for the same version of Intel CSME. I checked with the Intel utility immediately after upgrading to version 11.8.70.3626 but also after reading your message.

Zitat von hydropepon im Beitrag #4736

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After flashing my ASUS ROG Strix Z270H(7700K CPU) to v11.8.71.3630 if I overclock the system (by activating XMP for example) the PC can no longer boot up and I have to Clear CMOS to get back into UEFI. Any help on how to rectify this would be appreciated (Help that doesn't involve just downgrading back to 11.8.70.3626 etc). Thank you kindly.

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Zitat von Fernando im Beitrag #4734

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According to my test results the flashing procedure is not more risky than any other one, if you make sure, that you
a) flash the absolutely matching specific Firmware version/variant and
b) use the latest available "r" version of the Intel CSME System Tools v11.

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My PRIME z370 overclocks and uses XMP as before with 3630, no problem. Sync all cores, core max speed, voltage offset...