#1 How to extract SN, UUID, etc from BIOS dump by pppig236 12.09.2021 06:49

Long story short, I did an undervolt and overclock inside BIOS on my Legion 7i gen 6 (2021) and it didn't boot anymore and was unable to POST. I backuped the original BIOS with CH341a and flashed factory BIOS which I extracted using InsydeImageExtractor + UEFITool. However, it still didn't boot so I returned the programmer and was waiting to get the mobo replaced.
As I read through forums, I found out that Lenovo techs always forget to restore SN, etc after the repair hence I'm looking for an approach to extract the board specific infos from the BIOS dump(it's better if I could also make it boot while at it). If anyone knows how to do it, and is willing to do it for me or teach me about it, I attached the old.bin which is the backup and the BIOS region I extracted from official factory BIOS.(link to official factory BIOS: h_ttps://download.lenovo.com/consumer/mobiles/h1cn33ww.exe in case I did anything wrong with extracting)
I also hope to see some inputs on why mine still failed to POST even after the flash, whether it's a wrong procedure or something else I missed when programming.
Note: my BIOS chip is XMC XM25QH128AHIG, and I used NeoProgrammer with 0 errors when flashing.

Any help is appreciated!

#2 RE: How to extract SN, UUID, etc from BIOS dump by Sweet Kitten 12.09.2021 10:27

@pppig236
A module with the GUID starting with FFF12B8D contains your data.

#3 RE: How to extract SN, UUID, etc from BIOS dump by pppig236 12.09.2021 15:07

I see, that's the VSS Store within the NVRAM volume hence I all have to do is just replacing the padding in factory BIOS with the VSS extracted from my old.bin right?
Also I'm not sure if that's the place where the bad UV/OC values are stored. Can you take a look at that as well? Thanks in adavnce.

#4 RE: How to extract SN, UUID, etc from BIOS dump by Sweet Kitten 12.09.2021 15:43

Zitat von pppig236 im Beitrag #3
I all have to do is just replacing the padding in factory BIOS with the VSS extracted from my old.bin right?
The VSS store of the BIOS dump also contains the overclocking values ​​that made your Lenovo impossible to boot, so this cannot be done. You need to focus on replacing serial numbers.
I'll see what i can do.

#5 RE: How to extract SN, UUID, etc from BIOS dump by chantelmarry1 12.09.2021 16:07

I agree with you.

#6 RE: How to extract SN, UUID, etc from BIOS dump by pppig236 12.09.2021 17:15

I'm wondering if it's possible to edit the UV/OC values in my old dump and restore them to default

#7 RE: How to extract SN, UUID, etc from BIOS dump by pppig236 12.09.2021 17:41

I tried doing it using H2O EZE but it force closes whenever I opened up the setup menu section and selected update default...

#8 RE: How to extract SN, UUID, etc from BIOS dump by pppig236 12.09.2021 21:55

So I used H2O UVE and it did allow me to edit some values except for CPU/GPU...

#9 RE: How to extract SN, UUID, etc from BIOS dump by Sweet Kitten 13.09.2021 20:33

@pppig236
Do you still have a programmer? I think I understand something, but I'm afraid itís not.

[[File:FF12B8D.jpg|none|fullsize]]

#10 RE: How to extract SN, UUID, etc from BIOS dump by pppig236 14.09.2021 03:07

Zitat von Sweet Kitten im Beitrag #9
@pppig236
Do you still have a programmer? I think I understand something, but I'm afraid itís not.



My new programmer is coming tomorrow, so I guess I'll test it out maybe.

#11 RE: How to extract SN, UUID, etc from BIOS dump by pppig236 15.09.2021 00:51

It didn't work sadly

#12 RE: How to extract SN, UUID, etc from BIOS dump by Sweet Kitten 15.09.2021 11:59

Zitat von pppig236 im Beitrag #11
It didn't work sadly
What happens if I add everything except VSS to a clean bios region?
I am attaching another archive.

#13 RE: How to extract SN, UUID, etc from BIOS dump by pppig236 15.09.2021 22:12

Sorry, the tech came today and got it fixed, SN, and other stuffs are present so no need to manually do it now(glad that they did remember to update the board infos), I didn't even need to reinstall windows and it's working out of box. Thanks for your time and effort anyways.

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