BIOS: Grub Guide and Grub List

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Modding BIOS with GRUB 
Credits to NRK, Bored, Hydro, CatGamerOP, IIgio, Ron and Velo 
 
GRUB can mod your motherboard and change hidden or locked settings/value in BIOS. 
Before modding your motherboards BIOS I wanna remind you this was not intended by the 
motherboards manufacturer. This can result in bricking your motherboard or making it perform worse if 
done wrong. If you follow along to this part of the guide correctly you should be fine. The most common 
example of doing it wrong is not using the correct varStore in the command while in grub. 
 
Okay, now first you wanna download your BIOS version from the manufacturers website, please 
download the right version that is being used by your motherboard, please check the version 
beforehand. The file you want is something like MAXIMUS-VII-HERO-ASUS-3503.CAP, as the 
motherboard is a MAXIMUS VII HERO and the bios version is 3503. After finding the correct file for 
your BIOS version you will want to download this file to open your BIOS file. 
https://cdn.discordapp.com/attachments/766680501284241460/772333101594312744/UEFITool_0
.28.0_win32.zip 
 
After opening the BIOS file you will use the search function to enter ‘’High Precision’’ or on Asrock 
boards ‘’Acpi HPET Table’’, this should show your main bios with multiple hidden settings. You will want 
to extract the files you found ‘’Extract as is...’’ 
 
After extracting the file you will load it and extract it again with this program. 
https://cdn.discordapp.com/attachments/766680501284241460/772333216844480512/IRFExtracto
r_0.3.6_win.zip 
 
After extracting the file to a .txt file you will rename it to a.txt and extract it with Bored’s tool 
https://github.com/BoringBoredom/extractsettings 
 
Bored’s tool will sort and format the file so it's easy to read and use. 
 
After sorting it you will open the b.txt file and find the settings that are hidden/that you couldn’t find in 
your BIOS originally like power saving features, global c states, C1E, power gating, power down, gear 
down, basically you will have to look thro your own bios settings and decide what you want to change. 
My list is just to have an idea on what to change. When finding settings note them down in a notepad or 
on your phone as you will need to know the values when changing the settings. 
 
Now make a bootable flash drive on FAT32 
Add all the files from this to the bootable drive. 
https://drive.google.com/file/d/19dgQck32yw1Q1Zq0RT4IEg1C2SCXVy5b/view?usp=sharing 
 
Set bios to UEFI, disable secure boot and boot to the bootable drive (If booting from USB doesn’t work, 
boot to EFI Shell from Bios) 
The EFI shell will open. Select your flash drive). You will see from the list which one it is. 
Type CD BOOT\EFI 
Type bootx64.efi 
 
GRUB will open. 
Here you can edit any setting that you noted down from the text files. 
 
To change you use this template: 
 
setup_var offset [value] [variable name] 
variable name is the VarStore 
 
 
 
 
https://cdn.discordapp.com/attachments/766680501284241460/772333101594312744/UEFITool_0.28.0_win32.zip
https://cdn.discordapp.com/attachments/766680501284241460/772333101594312744/UEFITool_0.28.0_win32.zip
https://cdn.discordapp.com/attachments/766680501284241460/772333216844480512/IRFExtractor_0.3.6_win.zip
https://cdn.discordapp.com/attachments/766680501284241460/772333216844480512/IRFExtractor_0.3.6_win.zip
https://github.com/BoringBoredom/extractsettings
https://drive.google.com/file/d/19dgQck32yw1Q1Zq0RT4IEg1C2SCXVy5b/view?usp=sharing
 
For example: 
 
Chipset Power Saving Features | VarOffset: 0xB7, VarStore: Setup (0x1) 
  Disabled: 0x0 
  Enabled: 0x1 (default) 
 
“​Setup_var 0xB7 0x0 Setup”​ this will disable Chipset Power Saving Features 
“Setup_var 0xB7 0x0 Setup”​ this will enable Chipset Power Saving Features 
“Setup_var 0xB7 Read Setup”​ this will show what setting it has it set to. 
 
After this is done you restart pc, and you should be done! 
 
My current Grub List of ​Maximus VII Hero z97​ motherboard 
 
Enable Hibernation | VarOffset: 0x17, Varstore: Setup (0x1) ​Disabled: 0x0 
PS/2 Keyboard and Mouse Support | VarOffset: 0x21, VarStore: Setup (0x1) ​Disabled: 0x2 
ACPI Sleep State | VarOffset: 0x14, VarStore: Setup (0x1) ​Suspend Disabled: 0x0 
CPU C-States | VarOffset: 0x4F, VarStore: Setup (0x1) ​Disabled: 0x0  
Enhanced C1 State | VarOffset: 0x56, VarStore: Setup (0x1) ​Disabled: 0x0 
CPU C-States | VarOffset: 0x4F, VarStore: Setup (0x1) ​Disabled: 0x0 
CPU C3 Report | VarOffset: 0x50, VarStore: Setup (0x1) ​Disabled: 0x0  
CPU C6 Report | VarOffset: 0x51, VarStore: Setup (0x1) ​Disabled: 0x0  
CPU C7 Report | VarOffset: 0x52, VarStore: Setup (0x1) ​Disabled: 0x0 
CPU C8 report | VarOffset: 0x63, VarStore: Setup (0x1) ​Disabled: 0x0  
CPU C9 report | VarOffset: 0x64, VarStore: Setup (0x1) ​Disabled: 0x0  
CPU C10 report | VarOffset: 0x65, VarStore: Setup (0x1) ​Disabled: 0x0  
C state Pre-Wake | VarOffset: 0x5F, VarStore: Setup (0x1) ​Disabled: 0x0  
Package C-States Support | VarOffset: 0x69, VarStore: Setup (0x1) ​C0/C1: 0x0 
PCIE LTR | VarOffset: 0x117, VarStore: Setup (0x1) ​Disabled: 0x0  
PCIE LTR Lock | VarOffset: 0x11F, VarStore: Setup (0x1) ​Disabled: 0x0  
PCIE LTR | VarOffset: 0x118, VarStore: Setup (0x1) ​Disabled: 0x0  
PCIE LTR Lock | VarOffset: 0x120, VarStore: Setup (0x1) ​Disabled: 0x0  
PCIE LTR | VarOffset: 0x119, VarStore: Setup (0x1) ​Disabled: 0x0  
PCIE LTR Lock | VarOffset: 0x121, VarStore: Setup (0x1) ​Disabled: 0x0  
PCIE LTR | VarOffset: 0x11A, VarStore: Setup (0x1) ​Disabled: 0x0  
PCIE LTR Lock | VarOffset: 0x122, VarStore: Setup (0x1) ​Disabled: 0x0  
PCIE LTR | VarOffset: 0x11B, VarStore: Setup (0x1) ​Disabled: 0x0  
PCIE LTR Lock | VarOffset: 0x123, VarStore: Setup (0x1) ​Disabled: 0x0  
PCIE LTR | VarOffset: 0x11C, VarStore: Setup (0x1) ​Disabled: 0x0  
PCIE LTR Lock | VarOffset: 0x124, VarStore: Setup (0x1) ​Disabled: 0x0  
PCIE LTR | VarOffset: 0x11D, VarStore: Setup (0x1) ​Disabled: 0x0  
PCIE LTR Lock | VarOffset: 0x125, VarStore: Setup (0x1) ​Disabled: 0x0  
PCIE LTR | VarOffset: 0x11E, VarStore: Setup (0x1) ​Disabled: 0x0  
PCIE LTR Lock | VarOffset: 0x126, VarStore: Setup (0x1) ​Disabled: 0x0  
Panel Power Enable | VarOffset: 0x2E1, VarStore: Setup (0x1) ​Enabled: 0x1 
Power Down Mode | VarOffset: 0x374, VarStore: Setup (0x1) ​No Power Down: 0x0 
Power Down Mode | VarOffset: 0x375, VarStore: Setup (0x1) ​No Power Down: 0x0 
DDR PowerDown and idle counter | VarOffset: 0x376, VarStore: Setup (0x1) ​PCODE: 0x0 
PowerDown Energy Ch0Dimm0 | VarOffset: 0x3B4, VarStore: Setup (0x1) ​Max: 0x3F or Min:0x0 
PowerDown Energy Ch0Dimm1 | VarOffset: 0x3B3, VarStore: Setup (0x1) ​Max: 0x3F or Min:0x0 
PowerDown Energy Ch1Dimm0 | VarOffset: 0x3BE, VarStore: Setup (0x1) ​Max: 0x3F or Min:0x0 
PowerDown Energy Ch1Dimm1 | VarOffset: 0x3BD, VarStore: Setup (0x1) ​Max: 0x3F or Min:0x0 
SelfRefresh Enable | VarOffset: 0x3C5, VarStore: Setup (0x1) ​Disabled: 0x0  
Enable Hibernation | VarOffset: 0x17, Varstore: Setup (0x1) ​Disabled: 0x0  
 
 
 
Also theres a link about Zoyata GRUB ideas, just dont change if you dont know what to do. 
https://imgur.com/a/wupJmpx 
 
 
https://imgur.com/a/wupJmpx