• UEFITool NE (press Show all assets)
• UEFITool 0.28.0 (why?)
• IFR Extractor
• UEFI Editor

• Drag and drop the BIOS file into UEFITool NE.

• Search (CTRL + F) for a known setting.

  

• Double-click the reference to Setup/PE32 image section at the bottom.

  

• Extract PE32 image section as is.

  

• Move ifrextractor.exe to the current folder, open the CLI inside and convert the .sct file you just extracted.

  ifrextractor.exe "Section_PE32_image_Setup_Setup.sct" verbose
  

  

• Scroll down inside the currently expanded section and find AMITSE and setupdata (sometimes both required files are under AMITSE). Extract PE32 image section as is and setupdata as body.

  

• Upload the 4 files to the UEFI Editor page.

  

• Navigation

  • Dotted underlined text has references to Forms and can be clicked.

• Menu

  • You can change the target Form of top-level references here. This is useful for UEFIs that have a custom Advanced Form.

    

  • E.g. on MSI boards, you can replace OC Profiles with Advanced (child of Setup) to gain access to a lot of Forms that are otherwise inaccessible due to missing references while still retaining access to OC Profiles. Press ESC after selecting OC Profiles to access Setup.

• Item visibility control

  • Make sure the parent forms are visible when targeting a setting. Use the top-right navigation to travel upwards.

  • If one method doesn't work, try the other one. Using both at the same time can cause issues. It varies from UEFI to UEFI.

  • Suppress If

    • A Suppress If opcode hides nested items if the condition is true. The presence of a Suppress If opcode doesn't always mean the condition is true. However, if it is, you can remove the suppression by unchecking the offset.

      

  • Access level

    • Another method of controlling item visibility is changing the access level. 05 usually works. A different value does not necessarily mean it's hidden. Here is a forum post by Lost_N_BIOS with possible access level values (CTRL + F 05/Yes).

      

• Press the UEFI Files download button to download the modified files and the change log.

• To find the correct sections in UEFITool 0.28.0 you can search for File GUIDs you copy from UEFITool NE.

• Replace files the same way you extracted them: Extract as is -> Replace as is and Extract body -> Replace body

  Example for Setup/PE32 image section:

  UEFITool NE:

  

  UEFITool 0.28.0:

  

• Save the modifications.

  

The section below is unrelated to the above tool.

Download datasone's modded shell and rename it to BOOTX64.EFI.

Format a USB drive as FAT32 and move BOOTX64.EFI to USB:\EFI\BOOT\ (create the folders EFI and BOOT manually). The final path of the shell will be USB:\EFI\BOOT\BOOTX64.EFI.

Download your current BIOS version from the motherboard vendor's site. The structure changes across different versions, so make sure you have the same BIOS.

Follow these instructions until and including the conversion with ifrextractor.exe.

Optionally, download IFR-Formatter.js (right-click and Save link as...) and node.exe. Place them in the same folder as the IFR Extractor output and execute node IFR-Formatter.js yourIfrExtractorOutput.txt in the CLI.

Disable Secure Boot and CSM and boot from the USB drive in UEFI mode.

OneOf Prompt: "Intel C-State", Help: "[...]", QuestionFlags: [...], QuestionId: [...], VarStoreId: 0x2, VarOffset: 0x14, Flags: [...], Size: 8, Min: [...], Max: [...], Step: [...] { [...] }
	OneOfOption Option: "Auto" Value: 2, Default, MfgDefault { [...] }
	OneOfOption Option: "Enabled" Value: 1 { [...] }
	OneOfOption Option: "Disabled" Value: 0 { [...] }
End  { 29 02 }

Size is a decimal in bits. Convert it to a hexadecimal in bytes.
Value is a decimal. Convert it to a hexadecimal.

Search for the VarStoreId to find the VarStoreName.

VarStore Guid: [...], VarStoreId: 0x2, Size: [...], Name: "CpuSetup" { [...] }

Intel C-State | VarStore: CpuSetup | VarOffset: 0x14 | Size: 0x1
    Auto: 0x2
    Enabled: 0x1
    Disabled: 0x0

setup_var_cv VarStoreName VarOffset Size Value

setup_var_cv CpuSetup 0x14 0x1 0x0

setup_var_cv VarStoreName VarOffset Size

setup_var_cv CpuSetup 0x14 0x1

To exit and reboot, type:

reboot

Workarounds for various issues (e.g. multiple Setup VarStores): legacy commands

If something unexpected happens, force shutdown and reset CMOS.