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IsmaelHG authored Apr 28, 2021
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@@ -10,20 +10,20 @@ Once you follow the steps, you should be able to write on "MSR 0x150" which basi

You should only use this tutorial if you get an "OC_Locked" message on VoltageShift or "FIVR Control - locked" on ThrottleStop

1. Dump the firmware from your mac: You can do this by using the flashrom tool on a live usb with a Linux distribution (like Ubuntu) or directly with an external programmer like the CH341A using an SOP8 Clip (only for 15" 2013-2014 models) / JTAG or desoldering the Firmware Chip. Check issue [#1](../../issues/1) about how to connect the programmer
1. Dump the firmware from your mac: You can do this by using the flashrom tool on a live usb with a Linux distribution (like Ubuntu) or directly with an external programmer like the CH341A using an SOP8 Clip (only for 15" 2013-2015 models) / JTAG adapter or desoldering the Firmware Chip. Check issue [#1](../../issues/1) about how to connect the programmer
2. When you're done, you should have an 8MB (8.388.608 bytes) file. Make sure you have a backup of this unmodified file
3. Download [UEFIPatch](https://github.com/LongSoft/UEFITool/releases/tag/0.21.5) , it's available for both Windows and Mac
4. Extract the zip and open the extracted folder. You'll see an "patched.txt" file.
5. Replace this file with the [patches.txt](patches.txt) file I uploaded on this repository
![alt text](patches.jpg)
6. Copy the ROM file from step 1 into the folder
7. Open a terminal, cd to the extracted folder, type the command "UEFIPatch.exe firmware.bin" or "UEFIPatch firmware.bin" on macOS. Don't worry about any "Unknown file system" warnings, if it says "Image Patched" you're ready to go.
![alt text](UEFIPatch.jpg)
![alt text](UEFIPatch.jpg)
8. Now you should see a new file "firmware.bin.patched" on your folder with same size as the old file (8.388.608 bytes).
9. Flash this patched firmware with an external programmer and your done. For my model, I used an CH341A connected with an SOP8 Clip

<img src="SOP8.jpg" width="294" height="359">

As you can see, I'm now able to undervolt with my 2014 15" MBP while usign the latest Big Sur 11.3 Update which includes the 431.0.0.0.0 firmware.
As you can see, I'm now able to undervolt with my 2014 15" MBP while using the latest Big Sur 11.3 Update which includes the 431.0.0.0.0 firmware.

![alt text](Undervolt.jpg)

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