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Opencore 0.6.3 allows you to work around CFG lock by giving you these values AppleXcpmCfgLock and AppleCpuPmCfgLock in Kernel > Quirks. However, the community seem to think this might cause instability issues so you might want to disable this CFG Lock in your BIOS and set those values to false I used the following guides to help me disable CFG lock on my Dell T7810. There is no one guide that works on this machine so I had to get all my clues from multiple guides First, I looked at this Dortania guidehttps://dortania.github.io/OpenCore-Post-Install/misc/msr-lock.html However, it hints that it doesnt work on Dell, it provides a link to a guide for Dell called dreamwhite’s guide https://github.com/dreamwhite/bios-extraction-guide/tree/master/Dell Finally I used some clue from this Reddit post as well https://www.reddit.com/r/hackintosh/comments/hz2rtm/cfg_lockunlocking_alternative_method/ So far, we have 3 places: Dortania, dreamwhite, and Reddit At a high level, you need to do these 2 steps in order to disable your CFG Lock:
You need to know these 2 steps at high level to make this work. It allows you to fill in the gap if my instruction is missing something. For example: I dont cover installing python here but as long as you know where you are at in the high level overview, you should not get lost. Get the memory location of the value that points to CFG Lock in your BIOSI used the dreamwhite’s guide but I ran into an issue at the very first step there. When I run this command in Ubuntu, I get some kind of error about DOCTYPE. Like it could not parse some html file
I realize now that I can use that python script in Windows and Mac successfully. I can also extract the exe file in Windows using an app called 7-Zip Once extracted, theres a bunch of files, one of them should have a name that tells you its modifying System BIOS. In my case, mine is named All the 3 guides above say you need to run UEFITool, so download and run that. Open the .bin file I referenced above. Go to menu Action > Search All other guides say to search for “CFG Lock” but for our BIOS, we will search for “MSR Lock”. For me, I got something like this:
Double click on that string, it should expand the structure of the BIOS. It should tell you that string is located under … Platform > Compressed section > PE32 image section Right click on “PE32 image section”, then select “extract as is”. Now I get a file named In the dreamwhite’s guide, theres a link to a script called IRExtractor. Open that app, load the sct file. Then click on extract. You should get a .txt file Open that text file, search for “MSR Lock” again, you will get something like this
Note the Change the CFG lock value from enabled to disabledThe Reddit guide I referenced above points me to a script called RU.efi Format a small USB drive as FAT32, you can use Rufus on Windows or Disk Utility on MacOS. Create a folder named “EFI”. In the “EFI” folder, create a folder named “BOOT”. Paste the “RU.efi” file into the “BOOT” folder Boot into the USB drive, you should get a screen like this Press “ALT” and “=” to get to this screen Hit the down arrow key until you find Now, my offset value is 0x72, yours might be different. To locate this value, i navigate to 0070 for the 7 part of 0x72. Then I go to 02 for the 2 part of 0x72 Change value 1 (enabled) to 0 (disabled). Press Ctrl + W to save Press Alt + Q to quit Now you can boot into MacOS with AppleXcpmCfgLock and AppleCpuPmCfgLock to false Note if you reset your BIOS setting, this value will be reset as well[link] [comments] |
You are literally a life saver.
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