Zitat von Sweet Kitten im Beitrag #15

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Good. And now the BIOS that I see does not have PFAT format and I can modify it. But the question is how to flash it back to SPI flash memory as there is error 167.
I think I have a solution, but the process may seem difficult for you:
You should use the RU.EFI shell to allow writing BIOS to SPI flash.

BIOS Lock VarOffset - 0x17
Flash Protection Range Registers VarOffset - 0x6DD
Change 01 to 00
You will find this variable in a store named "PchSetup".

Here's a useful example of using the program.

EDIT: I think it'll take a while for you to figure out how the shell app works, so I'm going to sleep now.

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Thank you for providing the needed assistance. It will indeed take time to understand how it works and I will read the guide carefully. Since I don't want to brick anything I will also look for making a back-up. I will return back on this topic asap :)