How to use "mod GRUB Shell"?

It seems I have to hack my BIOS, but I get stuck reading the docu:

https://dortania.github.io/OpenCore-Post-Install/misc/msr-lock.html#turning-off-cfg-lock-manually

I have a Gigabyte motherboard (https://www.gigabyte.com/at/Motherboard/GA-Z170X-UD5-TH-rev-10#ov). The docu says that the UEFI tool will not work on Firmware other then MSI, ASrock and ASUS. However, I could extract the setup part and convert it to text, I even found that very passage with Unicode text "CFG Lock".

However, then it says: "1. Run the Modified GRUB Shell and write the following command ..."

Where and how do I have to run that efi script?

Thank you, guys!

submitted by /u/rowild
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