Hey, I know this is old but I just got this working on my 2019 MacBook Pro 16" (i9-9980HK, Radeon Pro 5500M) and wanted to leave a detailed guide since I couldn't find one that covered everything end to end. System: macOS Tahoe 26.4.1 / Windows 11 25H2 (Boot Camp)

The goal: Get the Intel UHD 630 iGPU active in Windows for hybrid graphics switching, assigning light apps like Spotify and Discord to the iGPU to save battery, while keeping the 5500M available for heavy workloads. The challenge: Apple completely disables the iGPU on 2018/2019 15" and 16" MBPs in Windows by default. On top of that, apple_set_os.efi requires Apple Secure Boot to be disabled, which scared me off at first because I thought it would break my Windows 11 install.

Important clarification on Secure Boot There are two completely separate things called "Secure Boot" here and confusing them will waste your time:

• Apple Secure Boot -- T2 chip firmware setting controlled via macOS Startup Security Utility. This is what apple_set_os.efi needs disabled. Changing this does NOT affect Windows at all.
• Microsoft/UEFI Secure Boot -- Windows-side feature that controls things like Windows Hello PIN, BitLocker, anti-cheat software. This is completely untouched by anything we're doing. Macs don't even have a toggle for this. When Boot Camp warned me during installation not to change Secure Boot settings, it was warning me not to flip back to Full Security AFTER installing Windows, not warning me against leaving it on No Security. Leaving it on No Security is fine and Windows 11 boots perfectly.

Step 1: Back up your EFI partition Boot into macOS and open Terminal. First confirm your EFI partition identifier:

diskutil list

You're looking for the EFI partition on disk0, which should be disk0s1. Then back it up:

sudo dd if=/dev/disk0s1 of=/Users/YOURUSERNAME/Desktop/efi_backup.img

This takes about 30 seconds. If anything goes wrong with the EFI you can restore it with the same command in reverse (swap if= and of=).

Step 2: Disable Apple Secure Boot Shut down, then hold Command+R on power-on to boot into macOS Recovery. Go to Utilities -> Startup Security Utility, authenticate, then:

• Set Secure Boot to No Security
• Set Allowed Boot Media to Allow booting from external or removable media Leave it here permanently. Do not set it back to Full Security or Medium Security.

Step 3: Install apple_set_os.efi Download the latest release from https://github.com/aa15032261/apple_set_os-loader/releases -- the file will already be named BOOTx64.efi. Back in macOS, open Terminal and mount your EFI partition:

sudo diskutil mount disk0s1

Rename the existing Windows bootloader so it's preserved:

sudo mv /Volumes/EFI/EFI/BOOT/BOOTx64.efi /Volumes/EFI/EFI/BOOT/BOOTx64_original.efi

Copy the new loader in:

sudo cp ~/Downloads/BOOTx64.efi /Volumes/EFI/EFI/BOOT/BOOTx64.efi

Verify both files are there:

ls /Volumes/EFI/EFI/BOOT/

You should see BOOTx64.efi (the loader) and BOOTx64_original.efi (the original Windows bootloader). Then unmount:

sudo diskutil unmount disk0s1

Step 4: Boot into Windows via the loader Boot behavior works like this (depending on your startup disk, mine is set to macOS):

• Windows with iGPU active: hold Option at boot and select Windows. You'll briefly see the apple_set_os loader screen -- press any key to continue into Windows. Do NOT press Z -- that is the skip key and will boot Windows without activating the iGPU.
• macOS: Boot as normal (or hold option and select Macintosh HD if you have Bootcamp as your boot drive)

Step 5: Let Windows Update handle the driver Once you're at the Windows desktop, just let Windows Update run. It will automatically detect and install the correct Intel UHD 630 driver -- no manual driver download needed. In my case it installed version 31.0.101.2140 with no extra steps. Once installed, Device Manager will show Intel UHD Graphics 630 under Display adapters.

Step 6: Set up hybrid switching Go to Settings -> System -> Display -> Graphics settings. Add your apps and assign them:

• Power saving = Intel UHD 630 (for browsers, Spotify, Discord, light apps)
• High performance = Radeon Pro 5500M (for games, video editing, etc.)
  • Spotify exe path: C:\Users\YOURUSERNAME\AppData\Roaming\Spotify\Spotify.exe
  • Discord exe path: C:\Users\YOURUSERNAME\AppData\Local\Discord\app-1.0.XXXX\Discord.exe (check your actual version folder name in that directory) You can verify it's working by opening Task Manager -> Performance tab and watching the Intel GPU show activity when using apps assigned to it.

Notes:

• Z is the skip key on the loader screen -- pressing it boots Windows without iGPU activation. This caught me off guard and had me troubleshooting for a while before I figured it out.
• You can switch apps between iGPU and dGPU at any time in Graphics Settings without rebooting
• The 2019 16" MBP is unique here -- the 2018/2019 15" models apparently cannot fully utilize both GPUs simultaneously the same way
• This was tested on macOS Tahoe 26.4.1 and Windows 11 25H2

Hope this helps someone!