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Introduction

The aim of this guide is to help users with setup_var.efi.
Please note that it's a rewritten version of modGRUBShell.efi, and in my opinion is way better than RU.efi. Please note that if your BIOS is write-locked there's nothing to do here: blame the vendor.

Disclaimer

  • I am not responsible for bricked devices, dead SSD drives, thermonuclear war,
  • or you getting fired because your PC booting process failed. Please do some research
  • if you have any concerns about this procedure
  • before using it! YOU are choosing to make these modifications, and if
  • you blame me in any way for what happens to your device, I will laugh at you.
  • BOOM! goes the dynamite

Step 1: get the IFR and the offset

Read ru.efi.md

Step 2: run setup_var.efi

You can both choose to run it from a UEFI shell (like OpenShell.efi) or run it directly from OpenCore menu (useful in case you need to tweak BIOS options rapidly).

In any case, the syntax of the program doesn't change:

setup_var.efi <OFFSET> <VALUE> -n <VAR_NAME> -r

where:

  • <OFFSET> is the offset of the variable
  • <VALUE> is the value of the variable
  • -n <VAR_NAME> is the VarStoreName
  • -r reboots the system once written the value

e.g. if my CFG Lock offset is 0x527 under Setup VarStoreName and needs to be set to 0x0 the resulting command will be:

setup_var.efi 0x527 0x0 -n Setup -r

OpenCore config.plist setup

In case you wanna use the tool from OpenCore, add the tool under Misc/Tools context in config.plist, and make sure FullNvramAccess key is enabled.

I'll leave the copy-and-paste code (make sure to edit Arguments with your own):

<dict>
	<key>Arguments</key>
	<string>0x527 0x00 -n Setup --write_on_demand</string>
	<key>Auxiliary</key>
	<true/>
	<key>Comment</key>
	<string>UEFI command-line tool for read/write access of variables - CFG Lock unlock</string>
	<key>Enabled</key>
	<true/>
	<key>Flavour</key>
	<string>Auto</string>
	<key>FullNvramAccess</key>
	<true/>
	<key>Name</key>
	<string>setup_var - CFG Unlock</string>
	<key>Path</key>
	<string>setup_var.efi</string>
	<key>RealPath</key>
	<true/>
	<key>TextMode</key>
	<true/>
</dict>

Credits